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[2.0.x] Fixed #28613 -- Doc'd the return value for GenericForeignKey when the related object is deleted.

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Backport of 1a82fc245eb8ac4b131ec02a6ac3e112deb8d5a6 from master
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Tim Graham 2017-10-20 13:51:21 -04:00
parent b952db6772
commit f9a01d40d5
1 changed files with 7 additions and 0 deletions
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docs/ref/contrib/contenttypes.txt
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@ -335,6 +335,13 @@ creating a ``TaggedItem``::
>>> t.content_object
<User: Guido>
If the related object is deleted, the ``content_type`` and ``object_id`` fields
remain set to their original values and the ``GenericForeignKey`` returns
``None``::
>>> guido.delete()
>>> t.content_object # returns None
Due to the way :class:`~django.contrib.contenttypes.fields.GenericForeignKey`
is implemented, you cannot use such fields directly with filters (``filter()``
and ``exclude()``, for example) via the database API. Because a