#26226: prefetch_related with Prefetch with queryset with explicit Ordering
Ignored
- single order_by
-------------------------------+--------------------
Reporter: cancan101 | Owner: nobody
Type: Uncategorized | Status: new
Component: Uncategorized | Version: 1.9
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------+--------------------
This is a variation of https://code.djangoproject.com/ticket/26211 which
does not involve multiple calls to `order_by`.
Given these models:
{{{
class Parent(models.Model):
pass
class Child(models.Model):
saved_dt = models.DateTimeField(auto_now_add=True)
parent = models.ForeignKey(Parent)
}}}
why does this return `False`?:
{{{
>>> Parent.objects.prefetch_related(Prefetch('child_set',
Child.objects.order_by('saved_dt'))).first().child_set.all().ordered
False
}}}
it looks like the SQL queries generated do actually have the sort logic,
but the query set does not reflect this fact:
{{{
SELECT "prefetch_parent"."id" FROM "prefetch_parent" ORDER BY
"prefetch_parent"."id" ASC LIMIT 1; args=()
SELECT "prefetch_child"."id", "prefetch_child"."saved_dt",
"prefetch_child"."parent_id" FROM "prefetch_child" WHERE
"prefetch_child"."parent_id" IN (1) ORDER BY "prefetch_child"."saved_dt"
ASC; args=(1,)
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/26226>
Django <https://code.djangoproject.com/>
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