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Fixed #7785 -- Added a note in the contenttypes documentation that Ge…

…nericRelations must share a common field type for primary keys. Thanks to Rudolph for the suggestion and initial draft.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@7976 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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commit b5b0febc4cd5ad51aeb1ef7b37aaca6a7632519d 1 parent 825622d
@freakboy3742 freakboy3742 authored
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  1. +5 −0 docs/contenttypes.txt
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5 docs/contenttypes.txt
@@ -205,6 +205,11 @@ model. There are three parts to setting up a ``GenericForeignKey``:
models you'll be relating to. (For most models, this means an
``IntegerField`` or ``PositiveIntegerField``.)
+ This field must be of the same type as the primary key of the models
+ that will be involved in the generic relation. For example, if you use
+ ``IntegerField``, you won't be able to form a generic relation with a
+ model that uses a ``CharField`` as a primary key.
+
3. Give your model a ``GenericForeignKey``, and pass it the names of
the two fields described above. If these fields are named
"content_type" and "object_id", you can omit this -- those are the
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