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Code Issues 25 Releases Wiki Activity

Fixed #26264 -- Fixed prefetch_related() crashes with values_list(flat=True)

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This commit is contained in:
Attila Tovt 2016-02-26 07:28:48 +02:00 committed by Tim Graham
parent 3389c5ea22
commit 5e2c4d7afb
2 changed files with 17 additions and 5 deletions
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11
django/db/models/query.py
View File

@ -1421,11 +1421,12 @@ def prefetch_related_objects(model_instances, *related_lookups):
if not hasattr(obj, '_prefetched_objects_cache'):
try:
obj._prefetched_objects_cache = {}
except AttributeError:
# Must be in a QuerySet subclass that is not returning
# Model instances, either in Django or 3rd
# party. prefetch_related() doesn't make sense, so quit
# now.
except (AttributeError, TypeError):
# Must be an immutable object from
# values_list(flat=True), for example (TypeError) or
# a QuerySet subclass that isn't returning Model
# instances (AttributeError), either in Django or a 3rd
# party. prefetch_related() doesn't make sense, so quit.
good_objects = False
break
if not good_objects:

11
tests/prefetch_related/test_uuid.py
View File

@ -44,6 +44,17 @@ class UUIDPrefetchRelated(TestCase):
with self.assertNumQueries(0):
self.assertEqual(2, len(flea.pets_visited.all()))
def test_prefetch_related_from_uuid_model_to_uuid_model_with_values_flat(self):
pet = Pet.objects.create(name='Fifi')
pet.people.add(
Person.objects.create(name='Ellen'),
Person.objects.create(name='George'),
)
self.assertSequenceEqual(
Pet.objects.prefetch_related('fleas_hosted').values_list('id', flat=True),
[pet.id]
)
class UUIDPrefetchRelatedLookups(TestCase):