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Code Issues 25 Releases Wiki Activity

Corrected QuerySet.prefetch_related() note about GenericRelation().

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GenericRelation is a reverse generic relationship so it's always
homogeneous. Mentioning this as a restriction is confusing.
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Mariusz Felisiak 2023-09-16 06:57:38 +02:00 committed by GitHub
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docs/ref/models/querysets.txt
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@ -1149,10 +1149,11 @@ one-to-one.
``prefetch_related``, on the other hand, does a separate lookup for each
relationship, and does the 'joining' in Python. This allows it to prefetch
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
many-to-many, many-to-one, and
:class:`~django.contrib.contenttypes.fields.GenericRelation` 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.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