mirrors/django
mirrors/django
0
0
Fork 0
mirror of https://github.com/django/django.git synced 2024-11-29 14:46:18 +01:00
Code Issues Releases Wiki Activity

Removed a redundant example in contenttypes docs.

Browse Source
This commit is contained in:
Tim Graham 2016-05-16 11:23:56 -04:00
parent 85ef98dc6e
commit aa69f36984
1 changed files with 13 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
docs/ref/contrib/contenttypes.txt
View File

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