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Documented that GenericForeignKey fields can't be used transparently in 

filters. Refs #3006. Patch from rmyers.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@8417 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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Malcolm Tredinnick 2008-08-16 22:44:42 +00:00
parent 7c6071861e
commit f505bd6e41
1 changed files with 10 additions and 0 deletions
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docs/contenttypes.txt
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@ -227,6 +227,16 @@ creating a ``TaggedItem``::
>>> t.content_object >>> t.content_object
<User: Guido> <User: Guido>
Due to the way ``GenericForeignKey`` is implemeneted, you cannot use such
fields directly with filters (``filter()`` and ``exclude()``, for example) via
the database API. They aren't normal field objects. These examples will *not*
work::
# This will fail
>>> TaggedItem.objects.filter(content_object=guido)
# This will also fail
>>> TaggedItem.objects.get(content_object=guido)
Reverse generic relations Reverse generic relations
------------------------- -------------------------