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Fixed #7539, #13067 -- Added on_delete argument to ForeignKey to control cascade behavior. Also refactored deletion for efficiency and code clarity. Many thanks to Johannes Dollinger and Michael Glassford for extensive work on the patch, and to Alex Gaynor, Russell Keith-Magee, and Jacob Kaplan-Moss for review.

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git-svn-id: http://code.djangoproject.com/svn/django/trunk@14507 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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Carl Meyer
2010-11-09 16:46:42 +00:00
parent 3ba3294c6b
commit 616b30227d
28 changed files with 850 additions and 608 deletions
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10
docs/ref/contrib/contenttypes.txt
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@@ -341,6 +341,16 @@ pointing at it will be deleted as well. In the example above, this means that
if a ``Bookmark`` object were deleted, any ``TaggedItem`` objects pointing at
it would be deleted at the same time.
.. versionadded:: 1.3
Unlike :class:`~django.db.models.ForeignKey`,
:class:`~django.contrib.contenttypes.generic.GenericForeignKey` does not accept
an :attr:`~django.db.models.ForeignKey.on_delete` argument to customize this
behavior; if desired, you can avoid the cascade-deletion simply by not using
:class:`~django.contrib.contenttypes.generic.GenericRelation`, and alternate
behavior can be provided via the :data:`~django.db.models.signals.pre_delete`
signal.
Generic relations and aggregation
---------------------------------