#24912: prefetch_related fails with sqlite3 database and UUIDField primary keys
-------------------------------------+-------------------------------------
Reporter: brki | Owner: zedr
Type: Bug | Status: assigned
Component: Database layer | Version: master
(models, ORM) |
Severity: Normal | Resolution:
Keywords: UUIDField | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by zedr):
Interestingly, clearing the `prefetch_related` behavior does not fix the
problem:
{{{
>>> players = Player.objects.filter(id=self.player_id)
>>> # Enable prefetching
>>> players = players.prefetch_related('awards')
>>> # Disable prefetching (before the queryset is evaluated)
>>> players.prefetch_related(None)
>>> player = players.get()
>>> # For sqlite3, this fails with "2 != 0":
>>> self.assertEqual(2, len(player.awards.all()))
(0.000) QUERY = 'SELECT "model_fields_player"."id",
"model_fields_player"."name" FROM "model_fields_player" WHERE
"model_fields_player"."id" = %s' - PARAMS =
('9674a6f11c044484b89bac792e53e642',);
args=('9674a6f11c044484b89bac792e53e642',)
(0.000) QUERY = 'SELECT ("model_fields_player_awards"."player_id") AS
"_prefetch_related_val_player_id", "model_fields_award"."id",
"model_fields_award"."name" FROM "model_fields_award" INNER JOIN
"model_fields_player_awards" ON ( "model_fields_award"."id" =
"model_fields_player_awards"."award_id" ) WHERE
"model_fields_player_awards"."player_id" IN (%s)' - PARAMS =
('9674a6f11c044484b89bac792e53e642',);
args=('9674a6f11c044484b89bac792e53e642',)
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/24912#comment:6>
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