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Code Issues 32 Releases Wiki Activity

Removed usage of extra(select) in in forward many-to-many manager prefetch.

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Simon Charette 2023-03-26 13:35:28 -04:00
parent c6a4f853c7
commit ac5e56a47f
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1 changed files with 6 additions and 5 deletions
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11
django/db/models/fields/related_descriptors.py
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@ -76,6 +76,7 @@ from django.db import (
transaction,
)
from django.db.models import Manager, Q, Window, signals
from django.db.models.expressions import RawSQL
from django.db.models.functions import RowNumber
from django.db.models.lookups import GreaterThan, LessThanOrEqual
from django.db.models.query import QuerySet
@ -1181,11 +1182,11 @@ def create_forward_many_to_many_manager(superclass, rel, reverse):
join_table = fk.model._meta.db_table
connection = connections[queryset.db]
qn = connection.ops.quote_name
queryset = queryset.extra(
select={
"_prefetch_related_val_%s"
% f.attname: "%s.%s"
% (qn(join_table), qn(f.column))
queryset = queryset.annotate(
**{
f"_prefetch_related_val_{f.attname}": RawSQL(
"%s.%s" % (qn(join_table), qn(f.column)), ()
)
for f in fk.local_related_fields
}
)