Fixed #28820 -- Eliminated an extra query with QuerySet.update() on proxy models.

2 files changed, 8 insertions, 1 deletions

diff --git a/django/db/models/sql/subqueries.py b/django/db/models/sql/subqueries.py
index edff51a56a..e877daa4e6 100644
--- a/django/db/models/sql/subqueries.py
+++ b/django/db/models/sql/subqueries.py
@@ -122,7 +122,7 @@ class UpdateQuery(Query):
                     'Cannot update model field %r (only non-relations and '
                     'foreign keys permitted).' % field
                 )
-            if model is not self.get_meta().model:
+            if model is not self.get_meta().concrete_model:
                 self.add_related_update(model, field, val)
                 continue
             values_seq.append((field, model, val))
diff --git a/tests/proxy_models/tests.py b/tests/proxy_models/tests.py
index 5fdfbfb6bf..50d2c57dd4 100644
--- a/tests/proxy_models/tests.py
+++ b/tests/proxy_models/tests.py
@@ -276,6 +276,13 @@ class ProxyModelTests(TestCase):
         resp = [u.name for u in UserProxy.objects.all()]
         self.assertEqual(resp, ['Bruce'])
 
+    def test_proxy_update(self):
+        user = User.objects.create(name='Bruce')
+        with self.assertNumQueries(1):
+            UserProxy.objects.filter(id=user.id).update(name='George')
+        user.refresh_from_db()
+        self.assertEqual(user.name, 'George')
+
     def test_select_related(self):
         """
         We can still use `select_related()` to include related models in our