author | Lennard de Rijk <ljvderijk@gmail.com> |
Sat, 31 Jan 2009 13:48:48 +0000 | |
changeset 1107 | a878188e225c |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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import re |
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from bisect import bisect |
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try: |
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set |
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except NameError: |
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from sets import Set as set # Python 2.3 fallback |
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|
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from django.conf import settings |
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from django.db.models.related import RelatedObject |
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from django.db.models.fields.related import ManyToManyRel |
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from django.db.models.fields import AutoField, FieldDoesNotExist |
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from django.db.models.fields.proxy import OrderWrt |
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from django.db.models.loading import get_models, app_cache_ready |
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from django.utils.translation import activate, deactivate_all, get_language, string_concat |
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from django.utils.encoding import force_unicode, smart_str |
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from django.utils.datastructures import SortedDict |
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# Calculate the verbose_name by converting from InitialCaps to "lowercase with spaces". |
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get_verbose_name = lambda class_name: re.sub('(((?<=[a-z])[A-Z])|([A-Z](?![A-Z]|$)))', ' \\1', class_name).lower().strip() |
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DEFAULT_NAMES = ('verbose_name', 'db_table', 'ordering', |
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'unique_together', 'permissions', 'get_latest_by', |
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'order_with_respect_to', 'app_label', 'db_tablespace', |
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'abstract') |
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class Options(object): |
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def __init__(self, meta, app_label=None): |
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self.local_fields, self.local_many_to_many = [], [] |
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self.virtual_fields = [] |
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self.module_name, self.verbose_name = None, None |
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self.verbose_name_plural = None |
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self.db_table = '' |
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self.ordering = [] |
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self.unique_together = [] |
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self.permissions = [] |
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self.object_name, self.app_label = None, app_label |
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self.get_latest_by = None |
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self.order_with_respect_to = None |
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self.db_tablespace = settings.DEFAULT_TABLESPACE |
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self.admin = None |
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self.meta = meta |
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self.pk = None |
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self.has_auto_field, self.auto_field = False, None |
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self.one_to_one_field = None |
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self.abstract = False |
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self.parents = SortedDict() |
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self.duplicate_targets = {} |
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# Managers that have been inherited from abstract base classes. These |
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# are passed onto any children. |
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self.abstract_managers = [] |
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def contribute_to_class(self, cls, name): |
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from django.db import connection |
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from django.db.backends.util import truncate_name |
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cls._meta = self |
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self.installed = re.sub('\.models$', '', cls.__module__) in settings.INSTALLED_APPS |
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# First, construct the default values for these options. |
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self.object_name = cls.__name__ |
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self.module_name = self.object_name.lower() |
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self.verbose_name = get_verbose_name(self.object_name) |
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# Next, apply any overridden values from 'class Meta'. |
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if self.meta: |
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meta_attrs = self.meta.__dict__.copy() |
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for name in self.meta.__dict__: |
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# Ignore any private attributes that Django doesn't care about. |
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# NOTE: We can't modify a dictionary's contents while looping |
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# over it, so we loop over the *original* dictionary instead. |
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if name.startswith('_'): |
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del meta_attrs[name] |
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for attr_name in DEFAULT_NAMES: |
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if attr_name in meta_attrs: |
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setattr(self, attr_name, meta_attrs.pop(attr_name)) |
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elif hasattr(self.meta, attr_name): |
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setattr(self, attr_name, getattr(self.meta, attr_name)) |
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# unique_together can be either a tuple of tuples, or a single |
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# tuple of two strings. Normalize it to a tuple of tuples, so that |
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# calling code can uniformly expect that. |
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ut = meta_attrs.pop('unique_together', getattr(self, 'unique_together')) |
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if ut and not isinstance(ut[0], (tuple, list)): |
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ut = (ut,) |
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setattr(self, 'unique_together', ut) |
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|
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# verbose_name_plural is a special case because it uses a 's' |
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# by default. |
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setattr(self, 'verbose_name_plural', meta_attrs.pop('verbose_name_plural', string_concat(self.verbose_name, 's'))) |
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89 |
|
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# Any leftover attributes must be invalid. |
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if meta_attrs != {}: |
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raise TypeError, "'class Meta' got invalid attribute(s): %s" % ','.join(meta_attrs.keys()) |
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else: |
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self.verbose_name_plural = string_concat(self.verbose_name, 's') |
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del self.meta |
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96 |
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# If the db_table wasn't provided, use the app_label + module_name. |
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if not self.db_table: |
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self.db_table = "%s_%s" % (self.app_label, self.module_name) |
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self.db_table = truncate_name(self.db_table, connection.ops.max_name_length()) |
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101 |
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102 |
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def _prepare(self, model): |
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if self.order_with_respect_to: |
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self.order_with_respect_to = self.get_field(self.order_with_respect_to) |
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self.ordering = ('_order',) |
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107 |
else: |
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self.order_with_respect_to = None |
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|
109 |
|
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110 |
if self.pk is None: |
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111 |
if self.parents: |
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112 |
# Promote the first parent link in lieu of adding yet another |
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113 |
# field. |
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114 |
field = self.parents.value_for_index(0) |
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115 |
field.primary_key = True |
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116 |
self.setup_pk(field) |
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117 |
else: |
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118 |
auto = AutoField(verbose_name='ID', primary_key=True, |
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119 |
auto_created=True) |
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120 |
model.add_to_class('id', auto) |
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121 |
|
323
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122 |
# Determine any sets of fields that are pointing to the same targets |
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123 |
# (e.g. two ForeignKeys to the same remote model). The query |
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124 |
# construction code needs to know this. At the end of this, |
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125 |
# self.duplicate_targets will map each duplicate field column to the |
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126 |
# columns it duplicates. |
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127 |
collections = {} |
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128 |
for column, target in self.duplicate_targets.iteritems(): |
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129 |
try: |
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130 |
collections[target].add(column) |
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131 |
except KeyError: |
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132 |
collections[target] = set([column]) |
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133 |
self.duplicate_targets = {} |
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134 |
for elt in collections.itervalues(): |
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135 |
if len(elt) == 1: |
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136 |
continue |
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137 |
for column in elt: |
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138 |
self.duplicate_targets[column] = elt.difference(set([column])) |
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139 |
|
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140 |
def add_field(self, field): |
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141 |
# Insert the given field in the order in which it was created, using |
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142 |
# the "creation_counter" attribute of the field. |
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143 |
# Move many-to-many related fields from self.fields into |
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144 |
# self.many_to_many. |
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145 |
if field.rel and isinstance(field.rel, ManyToManyRel): |
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146 |
self.local_many_to_many.insert(bisect(self.local_many_to_many, field), field) |
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147 |
if hasattr(self, '_m2m_cache'): |
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148 |
del self._m2m_cache |
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149 |
else: |
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150 |
self.local_fields.insert(bisect(self.local_fields, field), field) |
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151 |
self.setup_pk(field) |
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152 |
if hasattr(self, '_field_cache'): |
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153 |
del self._field_cache |
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154 |
del self._field_name_cache |
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155 |
|
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156 |
if hasattr(self, '_name_map'): |
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157 |
del self._name_map |
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158 |
|
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|
159 |
def add_virtual_field(self, field): |
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160 |
self.virtual_fields.append(field) |
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161 |
|
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162 |
def setup_pk(self, field): |
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163 |
if not self.pk and field.primary_key: |
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164 |
self.pk = field |
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165 |
field.serialize = False |
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166 |
|
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167 |
def __repr__(self): |
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168 |
return '<Options for %s>' % self.object_name |
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169 |
|
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170 |
def __str__(self): |
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171 |
return "%s.%s" % (smart_str(self.app_label), smart_str(self.module_name)) |
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172 |
|
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173 |
def verbose_name_raw(self): |
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174 |
""" |
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175 |
There are a few places where the untranslated verbose name is needed |
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176 |
(so that we get the same value regardless of currently active |
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|
177 |
locale). |
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|
178 |
""" |
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179 |
lang = get_language() |
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180 |
deactivate_all() |
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|
181 |
raw = force_unicode(self.verbose_name) |
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182 |
activate(lang) |
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183 |
return raw |
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|
184 |
verbose_name_raw = property(verbose_name_raw) |
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|
185 |
|
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|
186 |
def _fields(self): |
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187 |
""" |
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|
188 |
The getter for self.fields. This returns the list of field objects |
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|
189 |
available to this model (including through parent models). |
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|
190 |
|
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191 |
Callers are not permitted to modify this list, since it's a reference |
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|
192 |
to this instance (not a copy). |
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|
193 |
""" |
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194 |
try: |
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|
195 |
self._field_name_cache |
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|
196 |
except AttributeError: |
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|
197 |
self._fill_fields_cache() |
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198 |
return self._field_name_cache |
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199 |
fields = property(_fields) |
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200 |
|
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|
201 |
def get_fields_with_model(self): |
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202 |
""" |
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|
203 |
Returns a sequence of (field, model) pairs for all fields. The "model" |
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|
204 |
element is None for fields on the current model. Mostly of use when |
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|
205 |
constructing queries so that we know which model a field belongs to. |
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|
206 |
""" |
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|
207 |
try: |
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|
208 |
self._field_cache |
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|
209 |
except AttributeError: |
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|
210 |
self._fill_fields_cache() |
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|
211 |
return self._field_cache |
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|
212 |
|
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|
213 |
def _fill_fields_cache(self): |
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|
214 |
cache = [] |
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215 |
for parent in self.parents: |
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|
216 |
for field, model in parent._meta.get_fields_with_model(): |
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217 |
if model: |
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218 |
cache.append((field, model)) |
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219 |
else: |
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|
220 |
cache.append((field, parent)) |
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221 |
cache.extend([(f, None) for f in self.local_fields]) |
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|
222 |
self._field_cache = tuple(cache) |
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|
223 |
self._field_name_cache = [x for x, _ in cache] |
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224 |
|
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225 |
def _many_to_many(self): |
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226 |
try: |
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self._m2m_cache |
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228 |
except AttributeError: |
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self._fill_m2m_cache() |
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return self._m2m_cache.keys() |
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many_to_many = property(_many_to_many) |
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232 |
|
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def get_m2m_with_model(self): |
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234 |
""" |
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The many-to-many version of get_fields_with_model(). |
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236 |
""" |
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237 |
try: |
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238 |
self._m2m_cache |
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239 |
except AttributeError: |
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self._fill_m2m_cache() |
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241 |
return self._m2m_cache.items() |
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242 |
|
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def _fill_m2m_cache(self): |
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cache = SortedDict() |
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for parent in self.parents: |
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for field, model in parent._meta.get_m2m_with_model(): |
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if model: |
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cache[field] = model |
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249 |
else: |
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cache[field] = parent |
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for field in self.local_many_to_many: |
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cache[field] = None |
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self._m2m_cache = cache |
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254 |
|
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def get_field(self, name, many_to_many=True): |
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256 |
""" |
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Returns the requested field by name. Raises FieldDoesNotExist on error. |
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258 |
""" |
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to_search = many_to_many and (self.fields + self.many_to_many) or self.fields |
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for f in to_search: |
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if f.name == name: |
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262 |
return f |
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raise FieldDoesNotExist, '%s has no field named %r' % (self.object_name, name) |
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264 |
|
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def get_field_by_name(self, name): |
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266 |
""" |
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267 |
Returns the (field_object, model, direct, m2m), where field_object is |
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the Field instance for the given name, model is the model containing |
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this field (None for local fields), direct is True if the field exists |
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on this model, and m2m is True for many-to-many relations. When |
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'direct' is False, 'field_object' is the corresponding RelatedObject |
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for this field (since the field doesn't have an instance associated |
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273 |
with it). |
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274 |
|
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275 |
Uses a cache internally, so after the first access, this is very fast. |
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276 |
""" |
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277 |
try: |
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278 |
try: |
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|
279 |
return self._name_map[name] |
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|
280 |
except AttributeError: |
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|
281 |
cache = self.init_name_map() |
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282 |
return cache[name] |
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283 |
except KeyError: |
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|
284 |
raise FieldDoesNotExist('%s has no field named %r' |
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|
285 |
% (self.object_name, name)) |
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|
286 |
|
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|
287 |
def get_all_field_names(self): |
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|
288 |
""" |
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|
289 |
Returns a list of all field names that are possible for this model |
323
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|
290 |
(including reverse relation names). This is used for pretty printing |
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|
291 |
debugging output (a list of choices), so any internal-only field names |
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|
292 |
are not included. |
54
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|
293 |
""" |
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|
294 |
try: |
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|
295 |
cache = self._name_map |
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|
296 |
except AttributeError: |
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|
297 |
cache = self.init_name_map() |
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|
298 |
names = cache.keys() |
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|
299 |
names.sort() |
323
ff1a9aa48cfd
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diff
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|
300 |
# Internal-only names end with "+" (symmetrical m2m related names being |
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|
301 |
# the main example). Trim them. |
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|
302 |
return [val for val in names if not val.endswith('+')] |
54
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|
303 |
|
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|
304 |
def init_name_map(self): |
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|
305 |
""" |
03e267d67478
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|
306 |
Initialises the field name -> field object mapping. |
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|
307 |
""" |
323
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changeset
|
308 |
cache = {} |
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|
309 |
# We intentionally handle related m2m objects first so that symmetrical |
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|
310 |
# m2m accessor names can be overridden, if necessary. |
54
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|
311 |
for f, model in self.get_all_related_m2m_objects_with_model(): |
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|
312 |
cache[f.field.related_query_name()] = (f, model, False, True) |
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|
313 |
for f, model in self.get_all_related_objects_with_model(): |
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|
314 |
cache[f.field.related_query_name()] = (f, model, False, False) |
323
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diff
changeset
|
315 |
for f, model in self.get_m2m_with_model(): |
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changeset
|
316 |
cache[f.name] = (f, model, True, True) |
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|
317 |
for f, model in self.get_fields_with_model(): |
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|
318 |
cache[f.name] = (f, model, True, False) |
54
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|
319 |
if self.order_with_respect_to: |
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|
320 |
cache['_order'] = OrderWrt(), None, True, False |
03e267d67478
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|
321 |
if app_cache_ready(): |
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|
322 |
self._name_map = cache |
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|
323 |
return cache |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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|
324 |
|
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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|
325 |
def get_add_permission(self): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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|
326 |
return 'add_%s' % self.object_name.lower() |
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|
327 |
|
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Major reorganization of the soc svn repo, to merge into a single App Engine
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|
328 |
def get_change_permission(self): |
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|
329 |
return 'change_%s' % self.object_name.lower() |
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Major reorganization of the soc svn repo, to merge into a single App Engine
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|
330 |
|
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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|
331 |
def get_delete_permission(self): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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|
332 |
return 'delete_%s' % self.object_name.lower() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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changeset
|
333 |
|
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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|
334 |
def get_all_related_objects(self, local_only=False): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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changeset
|
335 |
try: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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changeset
|
336 |
self._related_objects_cache |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
337 |
except AttributeError: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
338 |
self._fill_related_objects_cache() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
339 |
if local_only: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
340 |
return [k for k, v in self._related_objects_cache.items() if not v] |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
341 |
return self._related_objects_cache.keys() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
342 |
|
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
343 |
def get_all_related_objects_with_model(self): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
344 |
""" |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
345 |
Returns a list of (related-object, model) pairs. Similar to |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
346 |
get_fields_with_model(). |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
347 |
""" |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
348 |
try: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
349 |
self._related_objects_cache |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
350 |
except AttributeError: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
351 |
self._fill_related_objects_cache() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
352 |
return self._related_objects_cache.items() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
353 |
|
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
354 |
def _fill_related_objects_cache(self): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
355 |
cache = SortedDict() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
356 |
parent_list = self.get_parent_list() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
357 |
for parent in self.parents: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
358 |
for obj, model in parent._meta.get_all_related_objects_with_model(): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
359 |
if (obj.field.creation_counter < 0 or obj.field.rel.parent_link) and obj.model not in parent_list: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
360 |
continue |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
361 |
if not model: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
362 |
cache[obj] = parent |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
363 |
else: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
364 |
cache[obj] = model |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
365 |
for klass in get_models(): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
366 |
for f in klass._meta.local_fields: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
367 |
if f.rel and not isinstance(f.rel.to, str) and self == f.rel.to._meta: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
368 |
cache[RelatedObject(f.rel.to, klass, f)] = None |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
369 |
self._related_objects_cache = cache |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
370 |
|
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
371 |
def get_all_related_many_to_many_objects(self, local_only=False): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
372 |
try: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
373 |
cache = self._related_many_to_many_cache |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
374 |
except AttributeError: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
375 |
cache = self._fill_related_many_to_many_cache() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
376 |
if local_only: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
377 |
return [k for k, v in cache.items() if not v] |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
378 |
return cache.keys() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
379 |
|
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
380 |
def get_all_related_m2m_objects_with_model(self): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
381 |
""" |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
382 |
Returns a list of (related-m2m-object, model) pairs. Similar to |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
383 |
get_fields_with_model(). |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
384 |
""" |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
385 |
try: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
386 |
cache = self._related_many_to_many_cache |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
387 |
except AttributeError: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
388 |
cache = self._fill_related_many_to_many_cache() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
389 |
return cache.items() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
390 |
|
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
391 |
def _fill_related_many_to_many_cache(self): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
392 |
cache = SortedDict() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
393 |
parent_list = self.get_parent_list() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
394 |
for parent in self.parents: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
395 |
for obj, model in parent._meta.get_all_related_m2m_objects_with_model(): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
396 |
if obj.field.creation_counter < 0 and obj.model not in parent_list: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
397 |
continue |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
398 |
if not model: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
399 |
cache[obj] = parent |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
400 |
else: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
401 |
cache[obj] = model |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
402 |
for klass in get_models(): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
403 |
for f in klass._meta.local_many_to_many: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
404 |
if f.rel and not isinstance(f.rel.to, str) and self == f.rel.to._meta: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
405 |
cache[RelatedObject(f.rel.to, klass, f)] = None |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
406 |
if app_cache_ready(): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
407 |
self._related_many_to_many_cache = cache |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
408 |
return cache |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
409 |
|
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
410 |
def get_base_chain(self, model): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
411 |
""" |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
412 |
Returns a list of parent classes leading to 'model' (order from closet |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
413 |
to most distant ancestor). This has to handle the case were 'model' is |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
414 |
a granparent or even more distant relation. |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
415 |
""" |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
416 |
if not self.parents: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
417 |
return |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
418 |
if model in self.parents: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
419 |
return [model] |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
420 |
for parent in self.parents: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
421 |
res = parent._meta.get_base_chain(model) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
422 |
if res: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
423 |
res.insert(0, parent) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
424 |
return res |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
425 |
raise TypeError('%r is not an ancestor of this model' |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
426 |
% model._meta.module_name) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
427 |
|
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
428 |
def get_parent_list(self): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
429 |
""" |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
430 |
Returns a list of all the ancestor of this model as a list. Useful for |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
431 |
determining if something is an ancestor, regardless of lineage. |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
432 |
""" |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
433 |
result = set() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
434 |
for parent in self.parents: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
435 |
result.add(parent) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
436 |
result.update(parent._meta.get_parent_list()) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
437 |
return result |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
438 |
|
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
439 |
def get_ordered_objects(self): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
440 |
"Returns a list of Options objects that are ordered with respect to this object." |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
441 |
if not hasattr(self, '_ordered_objects'): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
442 |
objects = [] |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
443 |
# TODO |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
444 |
#for klass in get_models(get_app(self.app_label)): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
445 |
# opts = klass._meta |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
446 |
# if opts.order_with_respect_to and opts.order_with_respect_to.rel \ |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
447 |
# and self == opts.order_with_respect_to.rel.to._meta: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
448 |
# objects.append(opts) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
449 |
self._ordered_objects = objects |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
450 |
return self._ordered_objects |