author | Lennard de Rijk <ljvderijk@gmail.com> |
Tue, 07 Apr 2009 22:20:23 +0000 | |
changeset 2125 | c24e8423cd1a |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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""" |
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Classes allowing "generic" relations through ContentType and object-id fields. |
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""" |
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|
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from django.core.exceptions import ObjectDoesNotExist |
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from django.db import connection |
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from django.db.models import signals |
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from django.db import models |
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from django.db.models.fields.related import RelatedField, Field, ManyToManyRel |
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from django.db.models.loading import get_model |
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from django.forms import ModelForm |
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from django.forms.models import BaseModelFormSet, modelformset_factory, save_instance |
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from django.contrib.admin.options import InlineModelAdmin, flatten_fieldsets |
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from django.utils.encoding import smart_unicode |
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class GenericForeignKey(object): |
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""" |
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Provides a generic relation to any object through content-type/object-id |
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fields. |
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""" |
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def __init__(self, ct_field="content_type", fk_field="object_id"): |
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self.ct_field = ct_field |
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self.fk_field = fk_field |
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def contribute_to_class(self, cls, name): |
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self.name = name |
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self.model = cls |
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self.cache_attr = "_%s_cache" % name |
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cls._meta.add_virtual_field(self) |
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# For some reason I don't totally understand, using weakrefs here doesn't work. |
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signals.pre_init.connect(self.instance_pre_init, sender=cls, weak=False) |
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# Connect myself as the descriptor for this field |
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setattr(cls, name, self) |
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def instance_pre_init(self, signal, sender, args, kwargs, **_kwargs): |
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""" |
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Handles initializing an object with the generic FK instaed of |
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content-type/object-id fields. |
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""" |
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if self.name in kwargs: |
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value = kwargs.pop(self.name) |
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kwargs[self.ct_field] = self.get_content_type(obj=value) |
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kwargs[self.fk_field] = value._get_pk_val() |
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def get_content_type(self, obj=None, id=None): |
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# Convenience function using get_model avoids a circular import when |
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# using this model |
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ContentType = get_model("contenttypes", "contenttype") |
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if obj: |
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return ContentType.objects.get_for_model(obj) |
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elif id: |
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return ContentType.objects.get_for_id(id) |
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else: |
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# This should never happen. I love comments like this, don't you? |
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raise Exception("Impossible arguments to GFK.get_content_type!") |
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def __get__(self, instance, instance_type=None): |
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if instance is None: |
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raise AttributeError, u"%s must be accessed via instance" % self.name |
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|
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try: |
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return getattr(instance, self.cache_attr) |
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except AttributeError: |
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rel_obj = None |
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# Make sure to use ContentType.objects.get_for_id() to ensure that |
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# lookups are cached (see ticket #5570). This takes more code than |
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# the naive ``getattr(instance, self.ct_field)``, but has better |
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# performance when dealing with GFKs in loops and such. |
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f = self.model._meta.get_field(self.ct_field) |
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ct_id = getattr(instance, f.get_attname(), None) |
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if ct_id: |
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ct = self.get_content_type(id=ct_id) |
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try: |
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rel_obj = ct.get_object_for_this_type(pk=getattr(instance, self.fk_field)) |
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except ObjectDoesNotExist: |
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pass |
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setattr(instance, self.cache_attr, rel_obj) |
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return rel_obj |
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|
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def __set__(self, instance, value): |
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if instance is None: |
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raise AttributeError, u"%s must be accessed via instance" % self.related.opts.object_name |
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ct = None |
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fk = None |
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if value is not None: |
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ct = self.get_content_type(obj=value) |
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fk = value._get_pk_val() |
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|
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setattr(instance, self.ct_field, ct) |
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setattr(instance, self.fk_field, fk) |
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setattr(instance, self.cache_attr, value) |
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|
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class GenericRelation(RelatedField, Field): |
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"""Provides an accessor to generic related objects (e.g. comments)""" |
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def __init__(self, to, **kwargs): |
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kwargs['verbose_name'] = kwargs.get('verbose_name', None) |
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kwargs['rel'] = GenericRel(to, |
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related_name=kwargs.pop('related_name', None), |
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limit_choices_to=kwargs.pop('limit_choices_to', None), |
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symmetrical=kwargs.pop('symmetrical', True)) |
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# By its very nature, a GenericRelation doesn't create a table. |
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self.creates_table = False |
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# Override content-type/object-id field names on the related class |
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self.object_id_field_name = kwargs.pop("object_id_field", "object_id") |
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self.content_type_field_name = kwargs.pop("content_type_field", "content_type") |
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114 |
|
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kwargs['blank'] = True |
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kwargs['editable'] = False |
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kwargs['serialize'] = False |
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Field.__init__(self, **kwargs) |
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119 |
|
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def get_choices_default(self): |
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return Field.get_choices(self, include_blank=False) |
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122 |
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def value_to_string(self, obj): |
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qs = getattr(obj, self.name).all() |
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return smart_unicode([instance._get_pk_val() for instance in qs]) |
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126 |
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def m2m_db_table(self): |
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return self.rel.to._meta.db_table |
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129 |
|
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def m2m_column_name(self): |
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return self.object_id_field_name |
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132 |
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def m2m_reverse_name(self): |
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return self.model._meta.pk.column |
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135 |
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136 |
def contribute_to_class(self, cls, name): |
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super(GenericRelation, self).contribute_to_class(cls, name) |
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138 |
|
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# Save a reference to which model this class is on for future use |
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self.model = cls |
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141 |
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# Add the descriptor for the m2m relation |
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setattr(cls, self.name, ReverseGenericRelatedObjectsDescriptor(self)) |
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144 |
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def contribute_to_related_class(self, cls, related): |
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pass |
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def set_attributes_from_rel(self): |
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pass |
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150 |
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def get_internal_type(self): |
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return "ManyToManyField" |
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153 |
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def db_type(self): |
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# Since we're simulating a ManyToManyField, in effect, best return the |
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# same db_type as well. |
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return None |
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158 |
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def extra_filters(self, pieces, pos, negate): |
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""" |
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Return an extra filter to the queryset so that the results are filtered |
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on the appropriate content type. |
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""" |
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if negate: |
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return [] |
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ContentType = get_model("contenttypes", "contenttype") |
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content_type = ContentType.objects.get_for_model(self.model) |
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prefix = "__".join(pieces[:pos + 1]) |
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return [("%s__%s" % (prefix, self.content_type_field_name), |
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content_type)] |
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171 |
|
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class ReverseGenericRelatedObjectsDescriptor(object): |
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""" |
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This class provides the functionality that makes the related-object |
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managers available as attributes on a model class, for fields that have |
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multiple "remote" values and have a GenericRelation defined in their model |
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177 |
(rather than having another model pointed *at* them). In the example |
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"article.publications", the publications attribute is a |
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179 |
ReverseGenericRelatedObjectsDescriptor instance. |
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180 |
""" |
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181 |
def __init__(self, field): |
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self.field = field |
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183 |
|
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184 |
def __get__(self, instance, instance_type=None): |
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if instance is None: |
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186 |
raise AttributeError, "Manager must be accessed via instance" |
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187 |
|
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# This import is done here to avoid circular import importing this module |
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189 |
from django.contrib.contenttypes.models import ContentType |
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190 |
|
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191 |
# Dynamically create a class that subclasses the related model's |
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192 |
# default manager. |
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193 |
rel_model = self.field.rel.to |
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superclass = rel_model._default_manager.__class__ |
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RelatedManager = create_generic_related_manager(superclass) |
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196 |
|
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197 |
qn = connection.ops.quote_name |
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198 |
|
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199 |
manager = RelatedManager( |
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200 |
model = rel_model, |
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201 |
instance = instance, |
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symmetrical = (self.field.rel.symmetrical and instance.__class__ == rel_model), |
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join_table = qn(self.field.m2m_db_table()), |
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source_col_name = qn(self.field.m2m_column_name()), |
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target_col_name = qn(self.field.m2m_reverse_name()), |
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content_type = ContentType.objects.get_for_model(self.field.model), |
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content_type_field_name = self.field.content_type_field_name, |
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object_id_field_name = self.field.object_id_field_name |
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209 |
) |
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210 |
|
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211 |
return manager |
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212 |
|
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213 |
def __set__(self, instance, value): |
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if instance is None: |
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215 |
raise AttributeError, "Manager must be accessed via instance" |
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216 |
|
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manager = self.__get__(instance) |
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manager.clear() |
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219 |
for obj in value: |
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manager.add(obj) |
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221 |
|
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222 |
def create_generic_related_manager(superclass): |
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223 |
""" |
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224 |
Factory function for a manager that subclasses 'superclass' (which is a |
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225 |
Manager) and adds behavior for generic related objects. |
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""" |
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|
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class GenericRelatedObjectManager(superclass): |
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def __init__(self, model=None, core_filters=None, instance=None, symmetrical=None, |
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join_table=None, source_col_name=None, target_col_name=None, content_type=None, |
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content_type_field_name=None, object_id_field_name=None): |
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|
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super(GenericRelatedObjectManager, self).__init__() |
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self.core_filters = core_filters or {} |
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self.model = model |
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self.content_type = content_type |
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self.symmetrical = symmetrical |
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self.instance = instance |
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self.join_table = join_table |
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self.join_table = model._meta.db_table |
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self.source_col_name = source_col_name |
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self.target_col_name = target_col_name |
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self.content_type_field_name = content_type_field_name |
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self.object_id_field_name = object_id_field_name |
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self.pk_val = self.instance._get_pk_val() |
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|
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def get_query_set(self): |
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query = { |
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'%s__pk' % self.content_type_field_name : self.content_type.id, |
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'%s__exact' % self.object_id_field_name : self.pk_val, |
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} |
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return superclass.get_query_set(self).filter(**query) |
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|
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def add(self, *objs): |
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for obj in objs: |
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setattr(obj, self.content_type_field_name, self.content_type) |
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setattr(obj, self.object_id_field_name, self.pk_val) |
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obj.save() |
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add.alters_data = True |
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|
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def remove(self, *objs): |
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for obj in objs: |
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obj.delete() |
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remove.alters_data = True |
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|
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def clear(self): |
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for obj in self.all(): |
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obj.delete() |
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clear.alters_data = True |
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|
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def create(self, **kwargs): |
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kwargs[self.content_type_field_name] = self.content_type |
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kwargs[self.object_id_field_name] = self.pk_val |
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return super(GenericRelatedObjectManager, self).create(**kwargs) |
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create.alters_data = True |
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|
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return GenericRelatedObjectManager |
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|
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class GenericRel(ManyToManyRel): |
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def __init__(self, to, related_name=None, limit_choices_to=None, symmetrical=True): |
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self.to = to |
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self.related_name = related_name |
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self.limit_choices_to = limit_choices_to or {} |
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self.symmetrical = symmetrical |
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self.multiple = True |
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class BaseGenericInlineFormSet(BaseModelFormSet): |
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""" |
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A formset for generic inline objects to a parent. |
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""" |
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ct_field_name = "content_type" |
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ct_fk_field_name = "object_id" |
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|
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def __init__(self, data=None, files=None, instance=None, save_as_new=None): |
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opts = self.model._meta |
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self.instance = instance |
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self.rel_name = '-'.join(( |
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opts.app_label, opts.object_name.lower(), |
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self.ct_field.name, self.ct_fk_field.name, |
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300 |
)) |
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super(BaseGenericInlineFormSet, self).__init__( |
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queryset=self.get_queryset(), data=data, files=files, |
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prefix=self.rel_name |
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304 |
) |
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305 |
|
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def get_queryset(self): |
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# Avoid a circular import. |
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from django.contrib.contenttypes.models import ContentType |
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if self.instance is None: |
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return self.model._default_manager.empty() |
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return self.model._default_manager.filter(**{ |
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self.ct_field.name: ContentType.objects.get_for_model(self.instance), |
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self.ct_fk_field.name: self.instance.pk, |
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}) |
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315 |
|
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def save_new(self, form, commit=True): |
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# Avoid a circular import. |
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from django.contrib.contenttypes.models import ContentType |
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kwargs = { |
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self.ct_field.get_attname(): ContentType.objects.get_for_model(self.instance).pk, |
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self.ct_fk_field.get_attname(): self.instance.pk, |
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} |
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new_obj = self.model(**kwargs) |
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return save_instance(form, new_obj, commit=commit) |
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|
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def generic_inlineformset_factory(model, form=ModelForm, |
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formset=BaseGenericInlineFormSet, |
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ct_field="content_type", fk_field="object_id", |
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fields=None, exclude=None, |
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extra=3, can_order=False, can_delete=True, |
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max_num=0, |
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formfield_callback=lambda f: f.formfield()): |
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""" |
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Returns an ``GenericInlineFormSet`` for the given kwargs. |
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335 |
|
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336 |
You must provide ``ct_field`` and ``object_id`` if they different from the |
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337 |
defaults ``content_type`` and ``object_id`` respectively. |
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338 |
""" |
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339 |
opts = model._meta |
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340 |
# Avoid a circular import. |
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341 |
from django.contrib.contenttypes.models import ContentType |
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342 |
# if there is no field called `ct_field` let the exception propagate |
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343 |
ct_field = opts.get_field(ct_field) |
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344 |
if not isinstance(ct_field, models.ForeignKey) or ct_field.rel.to != ContentType: |
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345 |
raise Exception("fk_name '%s' is not a ForeignKey to ContentType" % ct_field) |
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346 |
fk_field = opts.get_field(fk_field) # let the exception propagate |
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347 |
if exclude is not None: |
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348 |
exclude.extend([ct_field.name, fk_field.name]) |
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349 |
else: |
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350 |
exclude = [ct_field.name, fk_field.name] |
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351 |
FormSet = modelformset_factory(model, form=form, |
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352 |
formfield_callback=formfield_callback, |
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353 |
formset=formset, |
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354 |
extra=extra, can_delete=can_delete, can_order=can_order, |
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355 |
fields=fields, exclude=exclude, max_num=max_num) |
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356 |
FormSet.ct_field = ct_field |
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357 |
FormSet.ct_fk_field = fk_field |
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358 |
return FormSet |
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359 |
|
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360 |
class GenericInlineModelAdmin(InlineModelAdmin): |
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361 |
ct_field = "content_type" |
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362 |
ct_fk_field = "object_id" |
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363 |
formset = BaseGenericInlineFormSet |
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364 |
|
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365 |
def get_formset(self, request, obj=None): |
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366 |
if self.declared_fieldsets: |
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367 |
fields = flatten_fieldsets(self.declared_fieldsets) |
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368 |
else: |
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369 |
fields = None |
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370 |
defaults = { |
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371 |
"ct_field": self.ct_field, |
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372 |
"fk_field": self.ct_fk_field, |
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373 |
"form": self.form, |
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374 |
"formfield_callback": self.formfield_for_dbfield, |
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375 |
"formset": self.formset, |
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376 |
"extra": self.extra, |
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377 |
"can_delete": True, |
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378 |
"can_order": False, |
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379 |
"fields": fields, |
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380 |
} |
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381 |
return generic_inlineformset_factory(self.model, **defaults) |
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382 |
|
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383 |
class GenericStackedInline(GenericInlineModelAdmin): |
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384 |
template = 'admin/edit_inline/stacked.html' |
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385 |
|
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386 |
class GenericTabularInline(GenericInlineModelAdmin): |
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387 |
template = 'admin/edit_inline/tabular.html' |