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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, transaction,
) )
from django.db.models import Manager, Q, Window, signals 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.functions import RowNumber
from django.db.models.lookups import GreaterThan, LessThanOrEqual from django.db.models.lookups import GreaterThan, LessThanOrEqual
from django.db.models.query import QuerySet 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 join_table = fk.model._meta.db_table
connection = connections[queryset.db] connection = connections[queryset.db]
qn = connection.ops.quote_name qn = connection.ops.quote_name
queryset = queryset.extra( queryset = queryset.annotate(
select={ **{
"_prefetch_related_val_%s" f"_prefetch_related_val_{f.attname}": RawSQL(
% f.attname: "%s.%s" "%s.%s" % (qn(join_table), qn(f.column)), ()
% (qn(join_table), qn(f.column)) )
for f in fk.local_related_fields for f in fk.local_related_fields
} }
) )