mirror of https://github.com/django/django.git
Removed a redundant example in contenttypes docs.
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@ -395,6 +395,14 @@ from ``TaggedItem``::
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>>> TaggedItem.objects.filter(bookmarks__url__contains='django')
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>>> TaggedItem.objects.filter(bookmarks__url__contains='django')
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<QuerySet [<TaggedItem: django>, <TaggedItem: python>]>
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<QuerySet [<TaggedItem: django>, <TaggedItem: python>]>
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Of course, if you don't add the reverse relationship, you can do the
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same types of lookups manually::
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>>> b = Bookmark.objects.get(url='https://www.djangoproject.com/')
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>>> bookmark_type = ContentType.objects.get_for_model(b)
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>>> TaggedItem.objects.filter(content_type__pk=bookmark_type.id, object_id=b.id)
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<QuerySet [<TaggedItem: django>, <TaggedItem: python>]>
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Just as :class:`~django.contrib.contenttypes.fields.GenericForeignKey`
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Just as :class:`~django.contrib.contenttypes.fields.GenericForeignKey`
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accepts the names of the content-type and object-ID fields as
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accepts the names of the content-type and object-ID fields as
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arguments, so too does
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arguments, so too does
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@ -406,30 +414,11 @@ referred to above used fields named ``content_type_fk`` and
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``object_primary_key`` to create its generic foreign key, then a
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``object_primary_key`` to create its generic foreign key, then a
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:class:`.GenericRelation` back to it would need to be defined like so::
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:class:`.GenericRelation` back to it would need to be defined like so::
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tags = GenericRelation(TaggedItem,
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tags = GenericRelation(
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TaggedItem,
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content_type_field='content_type_fk',
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content_type_field='content_type_fk',
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object_id_field='object_primary_key')
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object_id_field='object_primary_key',
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)
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Of course, if you don't add the reverse relationship, you can do the
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same types of lookups manually::
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>>> b = Bookmark.objects.get(url='https://www.djangoproject.com/')
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>>> bookmark_type = ContentType.objects.get_for_model(b)
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>>> TaggedItem.objects.filter(content_type__pk=bookmark_type.id,
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... object_id=b.id)
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<QuerySet [<TaggedItem: django>, <TaggedItem: python>]>
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Note that if the model in a
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:class:`~django.contrib.contenttypes.fields.GenericRelation` uses a
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non-default value for ``ct_field`` or ``fk_field`` in its
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:class:`~django.contrib.contenttypes.fields.GenericForeignKey` (for example, if
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you had a ``Comment`` model that uses ``ct_field="object_pk"``),
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you'll need to set ``content_type_field`` and/or ``object_id_field`` in
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the :class:`~django.contrib.contenttypes.fields.GenericRelation` to
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match the ``ct_field`` and ``fk_field``, respectively, in the
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:class:`~django.contrib.contenttypes.fields.GenericForeignKey`::
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comments = fields.GenericRelation(Comment, object_id_field="object_pk")
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Note also, that if you delete an object that has a
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Note also, that if you delete an object that has a
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:class:`~django.contrib.contenttypes.fields.GenericRelation`, any objects
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:class:`~django.contrib.contenttypes.fields.GenericRelation`, any objects
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