#29932: Queryset `difference()` after `intersection()` returns wrong queryset on
SQLite
-------------------------------------+-------------------------------------
Reporter: michaeldel | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 2.1
(models, ORM) |
Severity: Normal | Resolution:
Keywords: queryset sqlite | Triage Stage:
difference intersection | Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Description changed by michaeldel:
Old description:
> Considering a simple model
> {{{
> from django.db import models
>
> class Foo(models.Model):
> pass
> }}}
>
> Here is the minimal way to encounter this issue
> {{{
> Foo.objects.create(pk=1)
> Foo.objects.create(pk=2)
>
> a = Foo.objects.all()
> b = Foo.objects.intersection(Foo.objects.filter(pk=1))
>
> assert a.count() == 2
> assert b.count() == 1
>
> diff = a.difference(b)
>
> assert diff.exists() == 1 # fails with SQLite!
> }}}
> This operation however works as expected on PostgreSQL.
New description:
Considering a simple model
{{{
#!python
from django.db import models
class Foo(models.Model):
pass
}}}
Here is the minimal way to encounter this issue
{{{
#!python
Foo.objects.create(pk=1)
Foo.objects.create(pk=2)
a = Foo.objects.all()
b = Foo.objects.intersection(Foo.objects.filter(pk=1))
assert a.count() == 2
assert b.count() == 1
diff = a.difference(b)
assert diff.exists() == 1 # fails with SQLite!
}}}
This operation however works as expected on PostgreSQL.
--
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Ticket URL: <https://code.djangoproject.com/ticket/29932#comment:1>
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