author | Pawel Solyga <Pawel.Solyga@gmail.com> |
Fri, 10 Oct 2008 13:14:24 +0000 | |
changeset 297 | 35211afcd563 |
parent 54 | 03e267d67478 |
child 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
54
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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 import oldforms |
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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.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.dispatch import dispatcher |
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from django.utils.functional import curry |
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|
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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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|
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def contribute_to_class(self, cls, name): |
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# Make sure the fields exist (these raise FieldDoesNotExist, |
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# which is a fine error to raise here) |
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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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|
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# For some reason I don't totally understand, using weakrefs here doesn't work. |
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dispatcher.connect(self.instance_pre_init, signal=signals.pre_init, sender=cls, weak=False) |
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|
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# Connect myself as the descriptor for this field |
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setattr(cls, name, self) |
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|
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def instance_pre_init(self, signal, sender, args, 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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|
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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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|
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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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|
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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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|
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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 (i.e. comments)""" |
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|
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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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|
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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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|
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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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115 |
|
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def get_manipulator_field_objs(self): |
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choices = self.get_choices_default() |
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return [curry(oldforms.SelectMultipleField, size=min(max(len(choices), 5), 15), choices=choices)] |
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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 flatten_data(self, follow, obj = None): |
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new_data = {} |
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if obj: |
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instance_ids = [instance._get_pk_val() for instance in getattr(obj, self.name).all()] |
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new_data[self.name] = instance_ids |
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return new_data |
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129 |
|
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130 |
def m2m_db_table(self): |
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return self.rel.to._meta.db_table |
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132 |
|
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def m2m_column_name(self): |
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return self.object_id_field_name |
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135 |
|
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def m2m_reverse_name(self): |
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return self.model._meta.pk.column |
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138 |
|
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139 |
def contribute_to_class(self, cls, name): |
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super(GenericRelation, self).contribute_to_class(cls, name) |
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141 |
|
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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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144 |
|
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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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147 |
|
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def contribute_to_related_class(self, cls, related): |
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pass |
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150 |
|
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def set_attributes_from_rel(self): |
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pass |
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153 |
|
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154 |
def get_internal_type(self): |
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return "ManyToManyField" |
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156 |
|
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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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160 |
return None |
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161 |
|
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162 |
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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167 |
(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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169 |
ReverseGenericRelatedObjectsDescriptor instance. |
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170 |
""" |
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171 |
def __init__(self, field): |
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self.field = field |
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173 |
|
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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, "Manager must be accessed via instance" |
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177 |
|
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# This import is done here to avoid circular import importing this module |
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179 |
from django.contrib.contenttypes.models import ContentType |
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180 |
|
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# Dynamically create a class that subclasses the related model's |
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# default manager. |
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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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186 |
|
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qn = connection.ops.quote_name |
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188 |
|
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189 |
manager = RelatedManager( |
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190 |
model = rel_model, |
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191 |
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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198 |
object_id_field_name = self.field.object_id_field_name |
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199 |
) |
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200 |
|
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201 |
return manager |
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202 |
|
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203 |
def __set__(self, instance, value): |
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if instance is None: |
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205 |
raise AttributeError, "Manager must be accessed via instance" |
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206 |
|
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207 |
manager = self.__get__(instance) |
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208 |
manager.clear() |
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209 |
for obj in value: |
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210 |
manager.add(obj) |
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211 |
|
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212 |
def create_generic_related_manager(superclass): |
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213 |
""" |
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214 |
Factory function for a manager that subclasses 'superclass' (which is a |
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215 |
Manager) and adds behavior for generic related objects. |
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216 |
""" |
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217 |
|
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218 |
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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221 |
content_type_field_name=None, object_id_field_name=None): |
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222 |
|
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223 |
super(GenericRelatedObjectManager, self).__init__() |
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224 |
self.core_filters = core_filters or {} |
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225 |
self.model = model |
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226 |
self.content_type = content_type |
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227 |
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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236 |
|
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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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243 |
|
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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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obj = self.model(**kwargs) |
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obj.save() |
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return obj |
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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.num_in_admin = 0 |
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self.related_name = related_name |
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self.filter_interface = None |
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self.limit_choices_to = limit_choices_to or {} |
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self.edit_inline = False |
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self.raw_id_admin = False |
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self.symmetrical = symmetrical |
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self.multiple = True |
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assert not (self.raw_id_admin and self.filter_interface), \ |
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"Generic relations may not use both raw_id_admin and filter_interface" |