#24912: prefetch_related fails with sqlite3 database and UUIDField primary keys
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Reporter: brki | Owner: nobody
Type: Bug | Status: new
Component: Database layer (models, ORM) | Version: 1.8
Severity: Normal | Keywords: UUIDField
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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Here's a test.py that fails on sqlite3, but succeeds if run on postgresql:
{{{
import uuid
from django.db import models
from django.test import TestCase
class Award(models.Model):
id = models.UUIDField(primary_key=True, default=uuid.uuid4)
name = models.CharField(max_length=20)
class Player(models.Model):
id = models.UUIDField(primary_key=True, default=uuid.uuid4)
name = models.CharField(max_length=20)
awards = models.ManyToManyField(Award)
class UUIDSqliteDemo(TestCase):
def setUp(self):
awards = [
Award.objects.create(name='star'),
Award.objects.create(name='trophy'),
]
player = Player.objects.create(name='Beth')
player.awards.add(*awards)
self.player_id = player.id
# This test passes if the target database is Postgresql, but fails for
sqlite3:
def test_prefetch_related(self):
players =
list(Player.objects.filter(id=self.player_id).prefetch_related('awards'))
player = players[0]
# For sqlite3, this fails with "2 != 0":
self.assertEqual(2, len(player.awards.all()))
}}}
I also tried using a CharField instead of a UUIDField as the pk field;
that worked fine. So it seems to be a problem with the UUIDField and
sqlite3 (or perhaps all non-Postgresql dbs?).
--
Ticket URL: <https://code.djangoproject.com/ticket/24912>
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