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Code Issues 25 Releases Wiki Activity

Fixed #30368 -- Fixed prefetch_related() for GenericForeignKey when PK is also a FK.

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Vinny Do 2019-04-16 17:49:16 +10:00 committed by Mariusz Felisiak
parent d610521bff
commit a4055adf70
3 changed files with 11 additions and 0 deletions
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1
AUTHORS
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@ -880,6 +880,7 @@ answer newbie questions, and generally made Django that much better:
Vinay Karanam <https://github.com/vinayinvicible>
Vinay Sajip <vinay_sajip@yahoo.co.uk>
Vincent Foley <vfoleybourgon@yahoo.ca>
Vinny Do <vdo.code@gmail.com>
Vitaly Babiy <vbabiy86@gmail.com>
Vladimir Kuzma <vladimirkuzma.ch@gmail.com>
Vlado <vlado@labath.org>

3
django/db/models/fields/related.py
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@ -939,6 +939,9 @@ class ForeignKey(ForeignObject):
def get_db_prep_value(self, value, connection, prepared=False):
return self.target_field.get_db_prep_value(value, connection, prepared)
def get_prep_value(self, value):
return self.target_field.get_prep_value(value)
def contribute_to_related_class(self, cls, related):
super().contribute_to_related_class(cls, related)
if self.remote_field.field_name is None:

7
tests/prefetch_related/tests.py
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@ -891,6 +891,13 @@ class GenericRelationTests(TestCase):
qs = Comment.objects.prefetch_related('content_object_uuid')
self.assertEqual([c.content_object_uuid for c in qs], [article])
def test_prefetch_GFK_fk_pk(self):
book = Book.objects.create(title='Poems')
book_with_year = BookWithYear.objects.create(book=book, published_year=2019)
Comment.objects.create(comment='awesome', content_object=book_with_year)
qs = Comment.objects.prefetch_related('content_object')
self.assertEqual([c.content_object for c in qs], [book_with_year])
def test_traverse_GFK(self):
"""
A 'content_object' can be traversed with prefetch_related() and