Fixed #26261 -- Fixed queryset crash when excluding reverse GenericRelation.

Thanks Amir Hadi for the report.

2 files changed, 11 insertions, 1 deletions

diff --git a/django/contrib/contenttypes/fields.py b/django/contrib/contenttypes/fields.py
index 72b9e7631a..35fcd0d908 100644
--- a/django/contrib/contenttypes/fields.py
+++ b/django/contrib/contenttypes/fields.py
@@ -461,7 +461,7 @@ class GenericRelation(ForeignObject):
                 to_opts=opts,
                 target_fields=(opts.pk,),
                 join_field=self,
-                m2m=not self.unique,
+                m2m=False,
                 direct=False,
                 filtered_relation=filtered_relation,
             )
diff --git a/tests/generic_relations_regress/tests.py b/tests/generic_relations_regress/tests.py
index 6c708fefbb..9b2f21b88b 100644
--- a/tests/generic_relations_regress/tests.py
+++ b/tests/generic_relations_regress/tests.py
@@ -308,3 +308,13 @@ class GenericRelationTests(TestCase):
         thing = HasLinkThing.objects.create()
         link = Link.objects.create(content_object=thing)
         self.assertCountEqual(link.targets.all(), [thing])
+
+    def test_generic_reverse_relation_exclude_filter(self):
+        place1 = Place.objects.create(name="Test Place 1")
+        place2 = Place.objects.create(name="Test Place 2")
+        Link.objects.create(content_object=place1)
+        link2 = Link.objects.create(content_object=place2)
+        qs = Link.objects.filter(~Q(places__name="Test Place 1"))
+        self.assertSequenceEqual(qs, [link2])
+        qs = Link.objects.exclude(places__name="Test Place 1")
+        self.assertSequenceEqual(qs, [link2])