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[1.9.x] Fixed #21422 -- Documented that prefetch_related() results must be homogeneous. 

Backport of 69239c0f96 from master
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Tim Graham 2015-10-29 18:56:57 -04:00
parent 8b92839769
commit 31a51a04e8
1 changed files with 4 additions and 1 deletions
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5
docs/ref/models/querysets.txt
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@ -884,7 +884,10 @@ many-to-many and many-to-one objects, which cannot be done using
``select_related``, in addition to the foreign key and one-to-one relationships
that are supported by ``select_related``. It also supports prefetching of
:class:`~django.contrib.contenttypes.fields.GenericRelation` and
:class:`~django.contrib.contenttypes.fields.GenericForeignKey`.
:class:`~django.contrib.contenttypes.fields.GenericForeignKey`, however, it
must be restricted to a homogeneous set of results. For example, prefetching
objects referenced by a ``GenericForeignKey`` is only supported if the query
is restricted to one ``ContentType``.
For example, suppose you have these models::