author | Lennard de Rijk <ljvderijk@gmail.com> |
Sat, 31 Jan 2009 12:36:06 +0000 | |
changeset 1104 | 02997d6661fa |
parent 54 | 03e267d67478 |
permissions | -rw-r--r-- |
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""" |
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These classes are light wrappers around Django's database API that provide |
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convenience functionality and permalink functions for the databrowse app. |
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""" |
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|
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from django.db import models |
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from django.utils import dateformat |
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from django.utils.text import capfirst |
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from django.utils.translation import get_date_formats |
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from django.utils.encoding import smart_unicode, smart_str, iri_to_uri |
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from django.utils.safestring import mark_safe |
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from django.db.models.query import QuerySet |
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|
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EMPTY_VALUE = '(None)' |
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DISPLAY_SIZE = 100 |
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|
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class EasyModel(object): |
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def __init__(self, site, model): |
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self.site = site |
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self.model = model |
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self.model_list = site.registry.keys() |
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self.verbose_name = model._meta.verbose_name |
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self.verbose_name_plural = model._meta.verbose_name_plural |
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|
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def __repr__(self): |
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return '<EasyModel for %s>' % smart_str(self.model._meta.object_name) |
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|
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def model_databrowse(self): |
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"Returns the ModelDatabrowse class for this model." |
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return self.site.registry[self.model] |
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def url(self): |
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return mark_safe('%s%s/%s/' % (self.site.root_url, self.model._meta.app_label, self.model._meta.module_name)) |
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|
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def objects(self, **kwargs): |
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return self.get_query_set().filter(**kwargs) |
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def get_query_set(self): |
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easy_qs = self.model._default_manager.get_query_set()._clone(klass=EasyQuerySet) |
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easy_qs._easymodel = self |
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return easy_qs |
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def object_by_pk(self, pk): |
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return EasyInstance(self, self.model._default_manager.get(pk=pk)) |
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def sample_objects(self): |
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for obj in self.model._default_manager.all()[:3]: |
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yield EasyInstance(self, obj) |
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def field(self, name): |
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try: |
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f = self.model._meta.get_field(name) |
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except models.FieldDoesNotExist: |
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return None |
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return EasyField(self, f) |
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def fields(self): |
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return [EasyField(self, f) for f in (self.model._meta.fields + self.model._meta.many_to_many)] |
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class EasyField(object): |
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def __init__(self, easy_model, field): |
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self.model, self.field = easy_model, field |
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def __repr__(self): |
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return smart_str(u'<EasyField for %s.%s>' % (self.model.model._meta.object_name, self.field.name)) |
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def choices(self): |
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for value, label in self.field.choices: |
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yield EasyChoice(self.model, self, value, label) |
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def url(self): |
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if self.field.choices: |
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return mark_safe('%s%s/%s/%s/' % (self.model.site.root_url, self.model.model._meta.app_label, self.model.model._meta.module_name, self.field.name)) |
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elif self.field.rel: |
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return mark_safe('%s%s/%s/' % (self.model.site.root_url, self.model.model._meta.app_label, self.model.model._meta.module_name)) |
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class EasyChoice(object): |
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def __init__(self, easy_model, field, value, label): |
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self.model, self.field = easy_model, field |
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self.value, self.label = value, label |
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def __repr__(self): |
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return smart_str(u'<EasyChoice for %s.%s>' % (self.model.model._meta.object_name, self.field.name)) |
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def url(self): |
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return mark_safe('%s%s/%s/%s/%s/' % (self.model.site.root_url, self.model.model._meta.app_label, self.model.model._meta.module_name, self.field.field.name, iri_to_uri(self.value))) |
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class EasyInstance(object): |
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def __init__(self, easy_model, instance): |
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self.model, self.instance = easy_model, instance |
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def __repr__(self): |
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return smart_str(u'<EasyInstance for %s (%s)>' % (self.model.model._meta.object_name, self.instance._get_pk_val())) |
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def __unicode__(self): |
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val = smart_unicode(self.instance) |
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if len(val) > DISPLAY_SIZE: |
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return val[:DISPLAY_SIZE] + u'...' |
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return val |
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def __str__(self): |
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return self.__unicode__().encode('utf-8') |
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def pk(self): |
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return self.instance._get_pk_val() |
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def url(self): |
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return mark_safe('%s%s/%s/objects/%s/' % (self.model.site.root_url, self.model.model._meta.app_label, self.model.model._meta.module_name, iri_to_uri(self.pk()))) |
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def fields(self): |
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""" |
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Generator that yields EasyInstanceFields for each field in this |
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113 |
EasyInstance's model. |
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114 |
""" |
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for f in self.model.model._meta.fields + self.model.model._meta.many_to_many: |
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yield EasyInstanceField(self.model, self, f) |
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117 |
|
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118 |
def related_objects(self): |
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119 |
""" |
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120 |
Generator that yields dictionaries of all models that have this |
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121 |
EasyInstance's model as a ForeignKey or ManyToManyField, along with |
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122 |
lists of related objects. |
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123 |
""" |
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124 |
for rel_object in self.model.model._meta.get_all_related_objects() + self.model.model._meta.get_all_related_many_to_many_objects(): |
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125 |
if rel_object.model not in self.model.model_list: |
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126 |
continue # Skip models that aren't in the model_list |
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em = EasyModel(self.model.site, rel_object.model) |
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128 |
yield { |
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129 |
'model': em, |
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130 |
'related_field': rel_object.field.verbose_name, |
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131 |
'object_list': [EasyInstance(em, i) for i in getattr(self.instance, rel_object.get_accessor_name()).all()], |
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132 |
} |
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133 |
|
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134 |
class EasyInstanceField(object): |
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def __init__(self, easy_model, instance, field): |
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self.model, self.field, self.instance = easy_model, field, instance |
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self.raw_value = getattr(instance.instance, field.name) |
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138 |
|
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139 |
def __repr__(self): |
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return smart_str(u'<EasyInstanceField for %s.%s>' % (self.model.model._meta.object_name, self.field.name)) |
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141 |
|
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142 |
def values(self): |
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143 |
""" |
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144 |
Returns a list of values for this field for this instance. It's a list |
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145 |
so we can accomodate many-to-many fields. |
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146 |
""" |
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147 |
# This import is deliberately inside the function because it causes |
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148 |
# some settings to be imported, and we don't want to do that at the |
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149 |
# module level. |
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150 |
if self.field.rel: |
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151 |
if isinstance(self.field.rel, models.ManyToOneRel): |
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objs = getattr(self.instance.instance, self.field.name) |
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153 |
elif isinstance(self.field.rel, models.ManyToManyRel): # ManyToManyRel |
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return list(getattr(self.instance.instance, self.field.name).all()) |
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155 |
elif self.field.choices: |
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objs = dict(self.field.choices).get(self.raw_value, EMPTY_VALUE) |
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157 |
elif isinstance(self.field, models.DateField) or isinstance(self.field, models.TimeField): |
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158 |
if self.raw_value: |
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159 |
date_format, datetime_format, time_format = get_date_formats() |
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160 |
if isinstance(self.field, models.DateTimeField): |
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161 |
objs = capfirst(dateformat.format(self.raw_value, datetime_format)) |
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162 |
elif isinstance(self.field, models.TimeField): |
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objs = capfirst(dateformat.time_format(self.raw_value, time_format)) |
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164 |
else: |
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165 |
objs = capfirst(dateformat.format(self.raw_value, date_format)) |
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166 |
else: |
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167 |
objs = EMPTY_VALUE |
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168 |
elif isinstance(self.field, models.BooleanField) or isinstance(self.field, models.NullBooleanField): |
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169 |
objs = {True: 'Yes', False: 'No', None: 'Unknown'}[self.raw_value] |
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170 |
else: |
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171 |
objs = self.raw_value |
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172 |
return [objs] |
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173 |
|
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174 |
def urls(self): |
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175 |
"Returns a list of (value, URL) tuples." |
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176 |
# First, check the urls() method for each plugin. |
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177 |
plugin_urls = [] |
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178 |
for plugin_name, plugin in self.model.model_databrowse().plugins.items(): |
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179 |
urls = plugin.urls(plugin_name, self) |
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180 |
if urls is not None: |
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181 |
#plugin_urls.append(urls) |
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182 |
values = self.values() |
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183 |
return zip(self.values(), urls) |
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184 |
if self.field.rel: |
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185 |
m = EasyModel(self.model.site, self.field.rel.to) |
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186 |
if self.field.rel.to in self.model.model_list: |
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187 |
lst = [] |
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188 |
for value in self.values(): |
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189 |
url = mark_safe('%s%s/%s/objects/%s/' % (self.model.site.root_url, m.model._meta.app_label, m.model._meta.module_name, iri_to_uri(value._get_pk_val()))) |
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190 |
lst.append((smart_unicode(value), url)) |
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191 |
else: |
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192 |
lst = [(value, None) for value in self.values()] |
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193 |
elif self.field.choices: |
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194 |
lst = [] |
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195 |
for value in self.values(): |
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196 |
url = mark_safe('%s%s/%s/fields/%s/%s/' % (self.model.site.root_url, self.model.model._meta.app_label, self.model.model._meta.module_name, self.field.name, iri_to_uri(self.raw_value))) |
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197 |
lst.append((value, url)) |
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198 |
elif isinstance(self.field, models.URLField): |
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199 |
val = self.values()[0] |
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200 |
lst = [(val, iri_to_uri(val))] |
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201 |
else: |
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202 |
lst = [(self.values()[0], None)] |
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203 |
return lst |
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204 |
|
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205 |
class EasyQuerySet(QuerySet): |
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206 |
""" |
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207 |
When creating (or cloning to) an `EasyQuerySet`, make sure to set the |
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208 |
`_easymodel` variable to the related `EasyModel`. |
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209 |
""" |
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210 |
def iterator(self, *args, **kwargs): |
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211 |
for obj in super(EasyQuerySet, self).iterator(*args, **kwargs): |
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212 |
yield EasyInstance(self._easymodel, obj) |
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213 |
|
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214 |
def _clone(self, *args, **kwargs): |
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215 |
c = super(EasyQuerySet, self)._clone(*args, **kwargs) |
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216 |
c._easymodel = self._easymodel |
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217 |
return c |