author | Lennard de Rijk <ljvderijk@gmail.com> |
Sun, 07 Dec 2008 10:23:10 +0000 | |
changeset 693 | 99081e8176b8 |
parent 109 | 620f9b141567 |
child 828 | f5fd65cc3bf3 |
permissions | -rwxr-xr-x |
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#!/usr/bin/env python |
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# |
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# Copyright 2007 Google Inc. |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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# |
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|
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"""Support for creating Django (new) forms from Datastore data models. |
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|
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This is our best shot at supporting as much of Django as possible: you |
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won't be able to use Django's db package, but you can use our |
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db package instead, and create Django forms from it, either fully |
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automatically, or with overrides. |
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|
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Some of the code here is strongly inspired by Django's own ModelForm |
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class (new in Django 0.97). Our code also supports Django 0.96 (so as |
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to be maximally compatible). Note that our API is always similar to |
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Django 0.97's API, even when used with Django 0.96 (which uses a |
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different API, chiefly form_for_model()). |
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Terminology notes: |
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- forms: always refers to the Django newforms subpackage |
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- field: always refers to a Django forms.Field instance |
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- property: always refers to a db.Property instance |
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Mapping between properties and fields: |
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+====================+===================+==============+====================+ |
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| Property subclass | Field subclass | datatype | widget; notes | |
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+====================+===================+==============+====================+ |
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| StringProperty | CharField | unicode | Textarea | |
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| | | | if multiline | |
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+--------------------+-------------------+--------------+--------------------+ |
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| TextProperty | CharField | unicode | Textarea | |
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+--------------------+-------------------+--------------+--------------------+ |
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| BlobProperty | FileField | str | skipped in v0.96 | |
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+--------------------+-------------------+--------------+--------------------+ |
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| DateTimeProperty | DateTimeField | datetime | skipped | |
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| | | | if auto_now[_add] | |
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+--------------------+-------------------+--------------+--------------------+ |
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| DateProperty | DateField | date | ditto | |
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+--------------------+-------------------+--------------+--------------------+ |
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| TimeProperty | TimeField | time | ditto | |
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+--------------------+-------------------+--------------+--------------------+ |
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| IntegerProperty | IntegerField | int or long | | |
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+--------------------+-------------------+--------------+--------------------+ |
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| FloatProperty | FloatField | float | CharField in v0.96 | |
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+--------------------+-------------------+--------------+--------------------+ |
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| BooleanProperty | BooleanField | bool | | |
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+--------------------+-------------------+--------------+--------------------+ |
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| UserProperty | CharField | users.User | | |
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+--------------------+-------------------+--------------+--------------------+ |
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| StringListProperty | CharField | list of str | Textarea | |
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+--------------------+-------------------+--------------+--------------------+ |
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| LinkProperty | URLField | str | | |
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+--------------------+-------------------+--------------+--------------------+ |
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| ReferenceProperty | ModelChoiceField* | db.Model | | |
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+--------------------+-------------------+--------------+--------------------+ |
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| _ReverseReferenceP.| None | <iterable> | always skipped | |
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+====================+===================+==============+====================+ |
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|
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Notes: |
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*: this Field subclasses is defined by us, not in Django. |
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""" |
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import itertools |
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|
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import django.core.exceptions |
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import django.utils.datastructures |
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|
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try: |
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from django import newforms as forms |
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except ImportError: |
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from django import forms |
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|
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try: |
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from django.utils.translation import ugettext_lazy as _ |
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except ImportError: |
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pass |
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|
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from google.appengine.api import users |
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from google.appengine.ext import db |
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|
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def monkey_patch(name, bases, namespace): |
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"""A 'metaclass' for adding new methods to an existing class. |
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|
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In this version, existing methods can't be overridden; this is by |
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design, to avoid accidents. |
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|
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Usage example: |
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class PatchClass(TargetClass): |
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__metaclass__ = monkey_patch |
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def foo(self, ...): ... |
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def bar(self, ...): ... |
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113 |
This is equivalent to: |
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114 |
|
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115 |
def foo(self, ...): ... |
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116 |
def bar(self, ...): ... |
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117 |
TargetClass.foo = foo |
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118 |
TargetClass.bar = bar |
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119 |
PatchClass = TargetClass |
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120 |
|
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121 |
Note that PatchClass becomes an alias for TargetClass; by convention |
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122 |
it is recommended to give PatchClass the same name as TargetClass. |
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123 |
""" |
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124 |
|
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125 |
assert len(bases) == 1, 'Exactly one base class is required' |
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126 |
base = bases[0] |
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127 |
for name, value in namespace.iteritems(): |
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128 |
if name not in ('__metaclass__', '__module__'): |
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129 |
assert name not in base.__dict__, "Won't override attribute %r" % (name,) |
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130 |
setattr(base, name, value) |
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131 |
return base |
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132 |
|
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133 |
|
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134 |
|
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135 |
|
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136 |
class Property(db.Property): |
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137 |
__metaclass__ = monkey_patch |
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138 |
|
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139 |
def get_form_field(self, form_class=forms.CharField, **kwargs): |
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"""Return a Django form field appropriate for this property. |
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141 |
|
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142 |
Args: |
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form_class: a forms.Field subclass, default forms.CharField |
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144 |
|
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145 |
Additional keyword arguments are passed to the form_class constructor, |
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146 |
with certain defaults: |
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147 |
required: self.required |
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148 |
label: prettified self.verbose_name, if not None |
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149 |
widget: a forms.Select instance if self.choices is non-empty |
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150 |
initial: self.default, if not None |
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151 |
|
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152 |
Returns: |
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A fully configured instance of form_class, or None if no form |
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154 |
field should be generated for this property. |
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155 |
""" |
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156 |
defaults = {'required': self.required} |
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157 |
if self.verbose_name: |
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158 |
defaults['label'] = self.verbose_name.capitalize().replace('_', ' ') |
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159 |
if self.choices: |
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160 |
choices = [] |
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161 |
if not self.required or (self.default is None and |
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162 |
'initial' not in kwargs): |
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163 |
choices.append(('', '---------')) |
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164 |
for choice in self.choices: |
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165 |
choices.append((str(choice), unicode(choice))) |
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166 |
defaults['widget'] = forms.Select(choices=choices) |
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167 |
if self.default is not None: |
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168 |
defaults['initial'] = self.default |
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169 |
defaults.update(kwargs) |
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170 |
return form_class(**defaults) |
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171 |
|
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172 |
def get_value_for_form(self, instance): |
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173 |
"""Extract the property value from the instance for use in a form. |
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174 |
|
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175 |
Override this to do a property- or field-specific type conversion. |
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176 |
|
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177 |
Args: |
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178 |
instance: a db.Model instance |
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179 |
|
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180 |
Returns: |
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181 |
The property's value extracted from the instance, possibly |
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182 |
converted to a type suitable for a form field; possibly None. |
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183 |
|
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184 |
By default this returns the instance attribute's value unchanged. |
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185 |
""" |
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186 |
return getattr(instance, self.name) |
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187 |
|
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188 |
def make_value_from_form(self, value): |
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189 |
"""Convert a form value to a property value. |
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190 |
|
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191 |
Override this to do a property- or field-specific type conversion. |
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192 |
|
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193 |
Args: |
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194 |
value: the cleaned value retrieved from the form field |
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195 |
|
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196 |
Returns: |
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197 |
A value suitable for assignment to a model instance's property; |
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198 |
possibly None. |
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199 |
|
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200 |
By default this converts the value to self.data_type if it |
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201 |
isn't already an instance of that type, except if the value is |
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202 |
empty, in which case we return None. |
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203 |
""" |
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204 |
if value in (None, ''): |
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205 |
return None |
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206 |
if not isinstance(value, self.data_type): |
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207 |
value = self.data_type(value) |
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208 |
return value |
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209 |
|
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210 |
|
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211 |
class StringProperty(db.StringProperty): |
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212 |
__metaclass__ = monkey_patch |
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213 |
|
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214 |
def get_form_field(self, **kwargs): |
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215 |
"""Return a Django form field appropriate for a string property. |
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216 |
|
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217 |
This sets the widget default to forms.Textarea if the property's |
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218 |
multiline attribute is set. |
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219 |
""" |
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220 |
defaults = {} |
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221 |
if self.multiline: |
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222 |
defaults['widget'] = forms.Textarea |
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223 |
defaults.update(kwargs) |
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224 |
return super(StringProperty, self).get_form_field(**defaults) |
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225 |
|
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226 |
|
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227 |
class TextProperty(db.TextProperty): |
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228 |
__metaclass__ = monkey_patch |
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|
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230 |
def get_form_field(self, **kwargs): |
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"""Return a Django form field appropriate for a text property. |
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232 |
|
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This sets the widget default to forms.Textarea. |
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""" |
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defaults = {'widget': forms.Textarea} |
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236 |
defaults.update(kwargs) |
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return super(TextProperty, self).get_form_field(**defaults) |
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|
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|
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class BlobProperty(db.BlobProperty): |
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__metaclass__ = monkey_patch |
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|
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def get_form_field(self, **kwargs): |
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"""Return a Django form field appropriate for a blob property. |
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245 |
|
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This defaults to a forms.FileField instance when using Django 0.97 |
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or later. For 0.96 this returns None, as file uploads are not |
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really supported in that version. |
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""" |
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if not hasattr(forms, 'FileField'): |
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return None |
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defaults = {'form_class': forms.FileField} |
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defaults.update(kwargs) |
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return super(BlobProperty, self).get_form_field(**defaults) |
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255 |
|
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def get_value_for_form(self, instance): |
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"""Extract the property value from the instance for use in a form. |
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258 |
|
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There is no way to convert a Blob into an initial value for a file |
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upload, so we always return None. |
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""" |
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262 |
return None |
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|
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def make_value_from_form(self, value): |
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"""Convert a form value to a property value. |
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266 |
|
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This extracts the content from the UploadedFile instance returned |
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by the FileField instance. |
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269 |
""" |
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270 |
if value.__class__.__name__ == 'UploadedFile': |
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return db.Blob(value.content) |
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return super(BlobProperty, self).make_value_from_form(value) |
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273 |
|
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274 |
|
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275 |
class DateTimeProperty(db.DateTimeProperty): |
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276 |
__metaclass__ = monkey_patch |
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277 |
|
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278 |
def get_form_field(self, **kwargs): |
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"""Return a Django form field appropriate for a date-time property. |
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280 |
|
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281 |
This defaults to a DateTimeField instance, except if auto_now or |
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282 |
auto_now_add is set, in which case None is returned, as such |
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283 |
'auto' fields should not be rendered as part of the form. |
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284 |
""" |
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285 |
if self.auto_now or self.auto_now_add: |
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286 |
return None |
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287 |
defaults = {'form_class': forms.DateTimeField} |
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288 |
defaults.update(kwargs) |
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289 |
return super(DateTimeProperty, self).get_form_field(**defaults) |
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290 |
|
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291 |
|
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292 |
class DateProperty(db.DateProperty): |
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293 |
__metaclass__ = monkey_patch |
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294 |
|
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295 |
def get_form_field(self, **kwargs): |
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296 |
"""Return a Django form field appropriate for a date property. |
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297 |
|
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298 |
This defaults to a DateField instance, except if auto_now or |
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299 |
auto_now_add is set, in which case None is returned, as such |
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300 |
'auto' fields should not be rendered as part of the form. |
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301 |
""" |
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302 |
if self.auto_now or self.auto_now_add: |
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303 |
return None |
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304 |
defaults = {'form_class': forms.DateField} |
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305 |
defaults.update(kwargs) |
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306 |
return super(DateProperty, self).get_form_field(**defaults) |
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307 |
|
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308 |
|
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309 |
class TimeProperty(db.TimeProperty): |
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310 |
__metaclass__ = monkey_patch |
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311 |
|
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312 |
def get_form_field(self, **kwargs): |
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313 |
"""Return a Django form field appropriate for a time property. |
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|
314 |
|
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315 |
This defaults to a TimeField instance, except if auto_now or |
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316 |
auto_now_add is set, in which case None is returned, as such |
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317 |
'auto' fields should not be rendered as part of the form. |
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318 |
""" |
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319 |
if self.auto_now or self.auto_now_add: |
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320 |
return None |
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321 |
defaults = {'form_class': forms.TimeField} |
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322 |
defaults.update(kwargs) |
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|
323 |
return super(TimeProperty, self).get_form_field(**defaults) |
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|
324 |
|
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|
325 |
|
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326 |
class IntegerProperty(db.IntegerProperty): |
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327 |
__metaclass__ = monkey_patch |
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|
328 |
|
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|
329 |
def get_form_field(self, **kwargs): |
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|
330 |
"""Return a Django form field appropriate for an integer property. |
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|
331 |
|
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|
332 |
This defaults to an IntegerField instance. |
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333 |
""" |
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334 |
defaults = {'form_class': forms.IntegerField} |
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|
335 |
defaults.update(kwargs) |
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336 |
return super(IntegerProperty, self).get_form_field(**defaults) |
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|
337 |
|
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|
338 |
|
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|
339 |
class FloatProperty(db.FloatProperty): |
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|
340 |
__metaclass__ = monkey_patch |
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|
341 |
|
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|
342 |
def get_form_field(self, **kwargs): |
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|
343 |
"""Return a Django form field appropriate for an integer property. |
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|
344 |
|
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|
345 |
This defaults to a FloatField instance when using Django 0.97 or |
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|
346 |
later. For 0.96 this defaults to the CharField class. |
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|
347 |
""" |
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|
348 |
defaults = {} |
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|
349 |
if hasattr(forms, 'FloatField'): |
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|
350 |
defaults['form_class'] = forms.FloatField |
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|
351 |
defaults.update(kwargs) |
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|
352 |
return super(FloatProperty, self).get_form_field(**defaults) |
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|
353 |
|
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|
354 |
|
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|
355 |
class BooleanProperty(db.BooleanProperty): |
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|
356 |
__metaclass__ = monkey_patch |
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changeset
|
357 |
|
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|
358 |
def get_form_field(self, **kwargs): |
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|
359 |
"""Return a Django form field appropriate for a boolean property. |
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|
360 |
|
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|
361 |
This defaults to a BooleanField. |
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|
362 |
""" |
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|
363 |
defaults = {'form_class': forms.BooleanField} |
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|
364 |
defaults.update(kwargs) |
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|
365 |
return super(BooleanProperty, self).get_form_field(**defaults) |
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|
366 |
|
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|
367 |
def make_value_from_form(self, value): |
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|
368 |
"""Convert a form value to a property value. |
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|
369 |
|
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|
370 |
This is needed to ensure that False is not replaced with None. |
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|
371 |
""" |
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changeset
|
372 |
if value is None: |
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|
373 |
return None |
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|
374 |
if isinstance(value, basestring) and value.lower() == 'false': |
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|
375 |
return False |
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|
376 |
return bool(value) |
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changeset
|
377 |
|
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changeset
|
378 |
|
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changeset
|
379 |
class UserProperty(db.UserProperty): |
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parents:
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|
380 |
__metaclass__ = monkey_patch |
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changeset
|
381 |
|
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changeset
|
382 |
def get_form_field(self, **kwargs): |
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diff
changeset
|
383 |
"""Return a Django form field appropriate for a user property. |
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parents:
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changeset
|
384 |
|
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diff
changeset
|
385 |
This defaults to a CharField whose initial value is the current |
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parents:
diff
changeset
|
386 |
username. |
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changeset
|
387 |
""" |
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changeset
|
388 |
defaults = {'initial': users.GetCurrentUser()} |
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parents:
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changeset
|
389 |
defaults.update(kwargs) |
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parents:
diff
changeset
|
390 |
return super(UserProperty, self).get_form_field(**defaults) |
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diff
changeset
|
391 |
|
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parents:
diff
changeset
|
392 |
|
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changeset
|
393 |
class StringListProperty(db.StringListProperty): |
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parents:
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changeset
|
394 |
__metaclass__ = monkey_patch |
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diff
changeset
|
395 |
|
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parents:
diff
changeset
|
396 |
|
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parents:
diff
changeset
|
397 |
def get_form_field(self, **kwargs): |
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diff
changeset
|
398 |
"""Return a Django form field appropriate for a StringList property. |
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parents:
diff
changeset
|
399 |
|
620f9b141567
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parents:
diff
changeset
|
400 |
This defaults to a Textarea widget with a blank initial value. |
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Load ../../google_appengine into trunk/thirdparty/google_appengine.
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parents:
diff
changeset
|
401 |
""" |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
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parents:
diff
changeset
|
402 |
defaults = {'widget': forms.Textarea, |
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Load ../../google_appengine into trunk/thirdparty/google_appengine.
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parents:
diff
changeset
|
403 |
'initial': ''} |
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Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
404 |
defaults.update(kwargs) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
405 |
return super(StringListProperty, self).get_form_field(**defaults) |
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parents:
diff
changeset
|
406 |
|
620f9b141567
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
407 |
def get_value_for_form(self, instance): |
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Load ../../google_appengine into trunk/thirdparty/google_appengine.
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parents:
diff
changeset
|
408 |
"""Extract the property value from the instance for use in a form. |
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parents:
diff
changeset
|
409 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
410 |
This joins a list of strings with newlines. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
411 |
""" |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
412 |
value = super(StringListProperty, self).get_value_for_form(instance) |
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Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
413 |
if not value: |
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parents:
diff
changeset
|
414 |
return None |
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Load ../../google_appengine into trunk/thirdparty/google_appengine.
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parents:
diff
changeset
|
415 |
if isinstance(value, list): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
416 |
value = '\n'.join(value) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
417 |
return value |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
418 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
419 |
def make_value_from_form(self, value): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
420 |
"""Convert a form value to a property value. |
620f9b141567
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
421 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
422 |
This breaks the string into lines. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
423 |
""" |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
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parents:
diff
changeset
|
424 |
if not value: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
425 |
return [] |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
426 |
if isinstance(value, basestring): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
427 |
value = value.splitlines() |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
428 |
return value |
620f9b141567
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
429 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
430 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
431 |
class LinkProperty(db.LinkProperty): |
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Load ../../google_appengine into trunk/thirdparty/google_appengine.
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parents:
diff
changeset
|
432 |
__metaclass__ = monkey_patch |
620f9b141567
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
433 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
434 |
def get_form_field(self, **kwargs): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
435 |
"""Return a Django form field appropriate for a URL property. |
620f9b141567
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
436 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
437 |
This defaults to a URLField instance. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
438 |
""" |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
439 |
defaults = {'form_class': forms.URLField} |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
440 |
defaults.update(kwargs) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
441 |
return super(LinkProperty, self).get_form_field(**defaults) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
442 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
443 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
444 |
class _WrapIter(object): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
445 |
"""Helper class whose iter() calls a given function to get an iterator.""" |
620f9b141567
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
446 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
447 |
def __init__(self, function): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
448 |
self._function = function |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
449 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
450 |
def __iter__(self): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
451 |
return self._function() |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
452 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
453 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
454 |
class ModelChoiceField(forms.Field): |
620f9b141567
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
455 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
456 |
default_error_messages = { |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
457 |
'invalid_choice': _(u'Please select a valid choice. ' |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
458 |
u'That choice is not one of the available choices.'), |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
459 |
} |
620f9b141567
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parents:
diff
changeset
|
460 |
|
620f9b141567
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parents:
diff
changeset
|
461 |
def __init__(self, reference_class, query=None, choices=None, |
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parents:
diff
changeset
|
462 |
empty_label=u'---------', |
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
463 |
required=True, widget=forms.Select, label=None, initial=None, |
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Load ../../google_appengine into trunk/thirdparty/google_appengine.
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parents:
diff
changeset
|
464 |
help_text=None, *args, **kwargs): |
620f9b141567
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parents:
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changeset
|
465 |
"""Constructor. |
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parents:
diff
changeset
|
466 |
|
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parents:
diff
changeset
|
467 |
Args: |
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parents:
diff
changeset
|
468 |
reference_class: required; the db.Model subclass used in the reference |
620f9b141567
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parents:
diff
changeset
|
469 |
query: optional db.Query; default db.Query(reference_class) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
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parents:
diff
changeset
|
470 |
choices: optional explicit list of (value, label) pairs representing |
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Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
471 |
available choices; defaults to dynamically iterating over the |
620f9b141567
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parents:
diff
changeset
|
472 |
query argument (or its default) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
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parents:
diff
changeset
|
473 |
empty_label: label to be used for the default selection item in |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
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parents:
diff
changeset
|
474 |
the widget; this is prepended to the choices |
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
475 |
required, widget, label, initial, help_text, *args, **kwargs: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
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parents:
diff
changeset
|
476 |
like for forms.Field.__init__(); widget defaults to forms.Select |
620f9b141567
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parents:
diff
changeset
|
477 |
""" |
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Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
478 |
assert issubclass(reference_class, db.Model) |
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
479 |
if query is None: |
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Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
480 |
query = db.Query(reference_class) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
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parents:
diff
changeset
|
481 |
assert isinstance(query, db.Query) |
620f9b141567
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parents:
diff
changeset
|
482 |
super(ModelChoiceField, self).__init__(required, widget, label, initial, |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
483 |
help_text, *args, **kwargs) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
484 |
self.empty_label = empty_label |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
485 |
self.reference_class = reference_class |
620f9b141567
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
486 |
self._query = query |
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
487 |
self._choices = choices |
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Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
488 |
self._update_widget_choices() |
620f9b141567
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parents:
diff
changeset
|
489 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
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parents:
diff
changeset
|
490 |
def _update_widget_choices(self): |
620f9b141567
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
491 |
"""Helper to copy the choices to the widget.""" |
620f9b141567
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
492 |
self.widget.choices = self.choices |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
493 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
494 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
495 |
def _get_query(self): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
496 |
"""Getter for the query attribute.""" |
620f9b141567
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
497 |
return self._query |
620f9b141567
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
498 |
|
620f9b141567
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
499 |
def _set_query(self, query): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
500 |
"""Setter for the query attribute. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
501 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
502 |
As a side effect, the widget's choices are updated. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
503 |
""" |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
504 |
self._query = query |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
505 |
self._update_widget_choices() |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
506 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
507 |
query = property(_get_query, _set_query) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
508 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
509 |
def _generate_choices(self): |
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Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
510 |
"""Generator yielding (key, label) pairs from the query results.""" |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
511 |
yield ('', self.empty_label) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
512 |
for inst in self._query: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
513 |
yield (inst.key(), unicode(inst)) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
514 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
515 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
516 |
def _get_choices(self): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
517 |
"""Getter for the choices attribute. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
518 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
519 |
This is required to return an object that can be iterated over |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
520 |
multiple times. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
521 |
""" |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
522 |
if self._choices is not None: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
523 |
return self._choices |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
524 |
return _WrapIter(self._generate_choices) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
525 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
526 |
def _set_choices(self, choices): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
527 |
"""Setter for the choices attribute. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
528 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
529 |
As a side effect, the widget's choices are updated. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
530 |
""" |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
531 |
self._choices = choices |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
532 |
self._update_widget_choices() |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
533 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
534 |
choices = property(_get_choices, _set_choices) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
535 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
536 |
def clean(self, value): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
537 |
"""Override Field.clean() to do reference-specific value cleaning. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
538 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
539 |
This turns a non-empty value into a model instance. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
540 |
""" |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
541 |
value = super(ModelChoiceField, self).clean(value) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
542 |
if not value: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
543 |
return None |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
544 |
instance = db.get(value) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
545 |
if instance is None: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
546 |
raise db.BadValueError(self.error_messages['invalid_choice']) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
547 |
return instance |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
548 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
549 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
550 |
class ReferenceProperty(db.ReferenceProperty): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
551 |
__metaclass__ = monkey_patch |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
552 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
553 |
def get_form_field(self, **kwargs): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
554 |
"""Return a Django form field appropriate for a reference property. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
555 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
556 |
This defaults to a ModelChoiceField instance. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
557 |
""" |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
558 |
defaults = {'form_class': ModelChoiceField, |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
559 |
'reference_class': self.reference_class} |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
560 |
defaults.update(kwargs) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
561 |
return super(ReferenceProperty, self).get_form_field(**defaults) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
562 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
563 |
def get_value_for_form(self, instance): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
564 |
"""Extract the property value from the instance for use in a form. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
565 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
566 |
This return the key object for the referenced object, or None. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
567 |
""" |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
568 |
value = super(ReferenceProperty, self).get_value_for_form(instance) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
569 |
if value is not None: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
570 |
value = value.key() |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
571 |
return value |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
572 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
573 |
def make_value_from_form(self, value): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
574 |
"""Convert a form value to a property value. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
575 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
576 |
This turns a key string or object into a model instance. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
577 |
""" |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
578 |
if value: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
579 |
if not isinstance(value, db.Model): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
580 |
value = db.get(value) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
581 |
return value |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
582 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
583 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
584 |
class _ReverseReferenceProperty(db._ReverseReferenceProperty): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
585 |
__metaclass__ = monkey_patch |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
586 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
587 |
def get_form_field(self, **kwargs): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
588 |
"""Return a Django form field appropriate for a reverse reference. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
589 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
590 |
This always returns None, since reverse references are always |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
591 |
automatic. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
592 |
""" |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
593 |
return None |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
594 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
595 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
596 |
def property_clean(prop, value): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
597 |
"""Apply Property level validation to value. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
598 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
599 |
Calls .make_value_from_form() and .validate() on the property and catches |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
600 |
exceptions generated by either. The exceptions are converted to |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
601 |
forms.ValidationError exceptions. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
602 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
603 |
Args: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
604 |
prop: The property to validate against. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
605 |
value: The value to validate. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
606 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
607 |
Raises: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
608 |
forms.ValidationError if the value cannot be validated. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
609 |
""" |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
610 |
if value is not None: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
611 |
try: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
612 |
prop.validate(prop.make_value_from_form(value)) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
613 |
except (db.BadValueError, ValueError), e: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
614 |
raise forms.ValidationError(unicode(e)) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
615 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
616 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
617 |
class ModelFormOptions(object): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
618 |
"""A simple class to hold internal options for a ModelForm class. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
619 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
620 |
Instance attributes: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
621 |
model: a db.Model class, or None |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
622 |
fields: list of field names to be defined, or None |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
623 |
exclude: list of field names to be skipped, or None |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
624 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
625 |
These instance attributes are copied from the 'Meta' class that is |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
626 |
usually present in a ModelForm class, and all default to None. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
627 |
""" |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
628 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
629 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
630 |
def __init__(self, options=None): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
631 |
self.model = getattr(options, 'model', None) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
632 |
self.fields = getattr(options, 'fields', None) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
633 |
self.exclude = getattr(options, 'exclude', None) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
634 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
635 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
636 |
class ModelFormMetaclass(type): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
637 |
"""The metaclass for the ModelForm class defined below. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
638 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
639 |
This is our analog of Django's own ModelFormMetaclass. (We |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
640 |
can't conveniently subclass that class because there are quite a few |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
641 |
differences.) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
642 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
643 |
See the docs for ModelForm below for a usage example. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
644 |
""" |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
645 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
646 |
def __new__(cls, class_name, bases, attrs): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
647 |
"""Constructor for a new ModelForm class instance. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
648 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
649 |
The signature of this method is determined by Python internals. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
650 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
651 |
All Django Field instances are removed from attrs and added to |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
652 |
the base_fields attribute instead. Additional Field instances |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
653 |
are added to this based on the Datastore Model class specified |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
654 |
by the Meta attribute. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
655 |
""" |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
656 |
fields = sorted(((field_name, attrs.pop(field_name)) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
657 |
for field_name, obj in attrs.items() |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
658 |
if isinstance(obj, forms.Field)), |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
659 |
key=lambda obj: obj[1].creation_counter) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
660 |
for base in bases[::-1]: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
661 |
if hasattr(base, 'base_fields'): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
662 |
fields = base.base_fields.items() + fields |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
663 |
declared_fields = django.utils.datastructures.SortedDict() |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
664 |
for field_name, obj in fields: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
665 |
declared_fields[field_name] = obj |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
666 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
667 |
opts = ModelFormOptions(attrs.get('Meta', None)) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
668 |
attrs['_meta'] = opts |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
669 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
670 |
base_models = [] |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
671 |
for base in bases: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
672 |
base_opts = getattr(base, '_meta', None) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
673 |
base_model = getattr(base_opts, 'model', None) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
674 |
if base_model is not None: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
675 |
base_models.append(base_model) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
676 |
if len(base_models) > 1: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
677 |
raise django.core.exceptions.ImproperlyConfigured( |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
678 |
"%s's base classes define more than one model." % class_name) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
679 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
680 |
if opts.model is not None: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
681 |
if base_models and base_models[0] is not opts.model: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
682 |
raise django.core.exceptions.ImproperlyConfigured( |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
683 |
'%s defines a different model than its parent.' % class_name) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
684 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
685 |
model_fields = django.utils.datastructures.SortedDict() |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
686 |
for name, prop in sorted(opts.model.properties().iteritems(), |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
687 |
key=lambda prop: prop[1].creation_counter): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
688 |
if opts.fields and name not in opts.fields: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
689 |
continue |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
690 |
if opts.exclude and name in opts.exclude: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
691 |
continue |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
692 |
form_field = prop.get_form_field() |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
693 |
if form_field is not None: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
694 |
model_fields[name] = form_field |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
695 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
696 |
model_fields.update(declared_fields) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
697 |
attrs['base_fields'] = model_fields |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
698 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
699 |
props = opts.model.properties() |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
700 |
for name, field in model_fields.iteritems(): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
701 |
prop = props.get(name) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
702 |
if prop: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
703 |
def clean_for_property_field(value, prop=prop, old_clean=field.clean): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
704 |
value = old_clean(value) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
705 |
property_clean(prop, value) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
706 |
return value |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
707 |
field.clean = clean_for_property_field |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
708 |
else: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
709 |
attrs['base_fields'] = declared_fields |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
710 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
711 |
return super(ModelFormMetaclass, cls).__new__(cls, |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
712 |
class_name, bases, attrs) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
713 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
714 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
715 |
class BaseModelForm(forms.BaseForm): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
716 |
"""Base class for ModelForm. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
717 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
718 |
This overrides the forms.BaseForm constructor and adds a save() method. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
719 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
720 |
This class does not have a special metaclass; the magic metaclass is |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
721 |
added by the subclass ModelForm. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
722 |
""" |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
723 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
724 |
def __init__(self, data=None, files=None, auto_id=None, prefix=None, |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
725 |
initial=None, error_class=None, label_suffix=None, |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
726 |
instance=None): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
727 |
"""Constructor. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
728 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
729 |
Args (all optional and defaulting to None): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
730 |
data: dict of data values, typically from a POST request) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
731 |
files: dict of file upload values; Django 0.97 or later only |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
732 |
auto_id, prefix: see Django documentation |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
733 |
initial: dict of initial values |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
734 |
error_class, label_suffix: see Django 0.97 or later documentation |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
735 |
instance: Model instance to be used for additional initial values |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
736 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
737 |
Except for initial and instance, these arguments are passed on to |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
738 |
the forms.BaseForm constructor unchanged, but only if not None. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
739 |
Some arguments (files, error_class, label_suffix) are only |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
740 |
supported by Django 0.97 or later. Leave these blank (i.e. None) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
741 |
when using Django 0.96. Their default values will be used with |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
742 |
Django 0.97 or later even when they are explicitly set to None. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
743 |
""" |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
744 |
opts = self._meta |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
745 |
self.instance = instance |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
746 |
object_data = {} |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
747 |
if instance is not None: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
748 |
for name, prop in instance.properties().iteritems(): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
749 |
if opts.fields and name not in opts.fields: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
750 |
continue |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
751 |
if opts.exclude and name in opts.exclude: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
752 |
continue |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
753 |
object_data[name] = prop.get_value_for_form(instance) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
754 |
if initial is not None: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
755 |
object_data.update(initial) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
756 |
kwargs = dict(data=data, files=files, auto_id=auto_id, |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
757 |
prefix=prefix, initial=object_data, |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
758 |
error_class=error_class, label_suffix=label_suffix) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
759 |
kwargs = dict((name, value) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
760 |
for name, value in kwargs.iteritems() |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
761 |
if value is not None) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
762 |
super(BaseModelForm, self).__init__(**kwargs) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
763 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
764 |
def save(self, commit=True): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
765 |
"""Save this form's cleaned data into a model instance. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
766 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
767 |
Args: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
768 |
commit: optional bool, default True; if true, the model instance |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
769 |
is also saved to the datastore. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
770 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
771 |
Returns: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
772 |
A model instance. If a model instance was already associated |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
773 |
with this form instance (either passed to the constructor with |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
774 |
instance=... or by a previous save() call), that same instance |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
775 |
is updated and returned; if no instance was associated yet, one |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
776 |
is created by this call. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
777 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
778 |
Raises: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
779 |
ValueError if the data couldn't be validated. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
780 |
""" |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
781 |
if not self.is_bound: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
782 |
raise ValueError('Cannot save an unbound form') |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
783 |
opts = self._meta |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
784 |
instance = self.instance |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
785 |
if instance is None: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
786 |
fail_message = 'created' |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
787 |
else: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
788 |
fail_message = 'updated' |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
789 |
if self.errors: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
790 |
raise ValueError("The %s could not be %s because the data didn't " |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
791 |
'validate.' % (opts.model.kind(), fail_message)) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
792 |
cleaned_data = self._cleaned_data() |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
793 |
converted_data = {} |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
794 |
propiter = itertools.chain( |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
795 |
opts.model.properties().iteritems(), |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
796 |
iter([('key_name', StringProperty(name='key_name'))]) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
797 |
) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
798 |
for name, prop in propiter: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
799 |
value = cleaned_data.get(name) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
800 |
if value is not None: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
801 |
converted_data[name] = prop.make_value_from_form(value) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
802 |
try: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
803 |
if instance is None: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
804 |
instance = opts.model(**converted_data) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
805 |
self.instance = instance |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
806 |
else: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
807 |
for name, value in converted_data.iteritems(): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
808 |
if name == 'key_name': |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
809 |
continue |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
810 |
setattr(instance, name, value) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
811 |
except db.BadValueError, err: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
812 |
raise ValueError('The %s could not be %s (%s)' % |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
813 |
(opts.model.kind(), fail_message, err)) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
814 |
if commit: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
815 |
instance.put() |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
816 |
return instance |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
817 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
818 |
def _cleaned_data(self): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
819 |
"""Helper to retrieve the cleaned data attribute. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
820 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
821 |
In Django 0.96 this attribute was called self.clean_data. In 0.97 |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
822 |
and later it's been renamed to self.cleaned_data, to avoid a name |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
823 |
conflict. This helper abstracts the difference between the |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
824 |
versions away from its caller. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
825 |
""" |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
826 |
try: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
827 |
return self.cleaned_data |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
828 |
except AttributeError: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
829 |
return self.clean_data |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
830 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
831 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
832 |
class ModelForm(BaseModelForm): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
833 |
"""A Django form tied to a Datastore model. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
834 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
835 |
Note that this particular class just sets the metaclass; all other |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
836 |
functionality is defined in the base class, BaseModelForm, above. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
837 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
838 |
Usage example: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
839 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
840 |
from google.appengine.ext import db |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
841 |
from google.appengine.ext.db import djangoforms |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
842 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
843 |
# First, define a model class |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
844 |
class MyModel(db.Model): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
845 |
foo = db.StringProperty() |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
846 |
bar = db.IntegerProperty(required=True, default=42) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
847 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
848 |
# Now define a form class |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
849 |
class MyForm(djangoforms.ModelForm): |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
850 |
class Meta: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
851 |
model = MyModel |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
852 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
853 |
You can now instantiate MyForm without arguments to create an |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
854 |
unbound form, or with data from a POST request to create a bound |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
855 |
form. You can also pass a model instance with the instance=... |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
856 |
keyword argument to create an unbound (!) form whose initial values |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
857 |
are taken from the instance. For bound forms, use the save() method |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
858 |
to return a model instance. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
859 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
860 |
Like Django's own corresponding ModelForm class, the nested Meta |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
861 |
class can have two other attributes: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
862 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
863 |
fields: if present and non-empty, a list of field names to be |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
864 |
included in the form; properties not listed here are |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
865 |
excluded from the form |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
866 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
867 |
exclude: if present and non-empty, a list of field names to be |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
868 |
excluded from the form |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
869 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
870 |
If exclude and fields are both non-empty, names occurring in both |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
871 |
are excluded (i.e. exclude wins). By default all property in the |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
872 |
model have a corresponding form field defined. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
873 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
874 |
It is also possible to define form fields explicitly. This gives |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
875 |
more control over the widget used, constraints, initial value, and |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
876 |
so on. Such form fields are not affected by the nested Meta class's |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
877 |
fields and exclude attributes. |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
878 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
879 |
If you define a form field named 'key_name' it will be treated |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
880 |
specially and will be used as the value for the key_name parameter |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
881 |
to the Model constructor. This allows you to create instances with |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
882 |
named keys. The 'key_name' field will be ignored when updating an |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
883 |
instance (although it will still be shown on the form). |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
884 |
""" |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
885 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
886 |
__metaclass__ = ModelFormMetaclass |