#24421: Querying a reverse ForeignObject relation using exclude() fails
-------------------------------------+-------------------------------------
Reporter: animan1 | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 1.7
(models, ORM) |
Severity: Normal | Resolution:
Keywords: ForeignObject, | Triage Stage: Accepted
MySQL, SQLite |
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by joeri):
I added some comments on what's happening. The whole generated query for
an exclude seems incorrect or incomplete.
{{{
def test_reverse_query(self):
membership =
Membership.objects.create(membership_country=self.usa, person=self.bob,
group=self.cia)
# The following query is generated for a filter:
#
# SELECT ... FROM "foreign_object_group" INNER JOIN
"foreign_object_membership" ON (
# "foreign_object_group"."group_country_id" =
"foreign_object_membership"."membership_country_id" AND
# "foreign_object_group"."id" =
"foreign_object_membership"."group_id"
# ) WHERE "foreign_object_membership"."id" = 1 ORDER BY
"foreign_object_group"."name" ASC
self.assertQuerysetEqual(
Group.objects.filter(membership=membership),
['<Group: CIA>']
)
# The following query is generated for an exclude:
#
# SELECT ... FROM "foreign_object_group" WHERE NOT (
# "foreign_object_group"."group_country_id" IN (
# SELECT U1."membership_country_id" AS Col1, U1."group_id"
AS Col2 FROM "foreign_object_membership" U1 WHERE U1."id" = 1
# )
# ) ORDER BY "foreign_object_group"."name" ASC
# The error by SQLite:
# OperationalError: only a single result allowed for a SELECT that
is part of an expression
self.assertQuerysetEqual(
Group.objects.exclude(membership=membership),
[]
)
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/24421#comment:3>
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