#34940: Filter queryset on "tuples" of values for multiple columns
-------------------------------------+-------------------------------------
Reporter: Xavier Blanchot | Owner: nobody
Type: New feature | Status: closed
Component: Database layer | Version: 4.2
(models, ORM) |
Severity: Normal | Resolution: wontfix
Keywords: Filter | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by David Sanders):
There is a way to achieve this, but I've only tested this with PostgreSQL
and it **only** works with psycopg2 – psycopg (3) changes the way
composite type adaptation works. (what's more confusing is that if you
try this with psycopg (3) it _mogrifies_ fine but if you try to run the
query it fails.)
{{{
class Foo(Model):
a = models.IntegerField()
b = models.IntegerField()
Foo.objects.create(a=1, b=1)
Foo.objects.create(a=1, b=2)
Foo.objects.create(a=1, b=3)
qs = (
Foo.objects.annotate(ab=RawSQL("a, b", params=[]))
.filter(ab__in=[(1, 1), (1, 3)])
.values("a", "b", "ab")
)
print(qs)
}}}
gives me:
{{{
<QuerySet [{'a': 1, 'b': 1, 'ab': '(1,1)'}, {'a': 1, 'b': 3, 'ab':
'(1,3)'}]>
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/34940#comment:3>
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