[3.1.x] Fixed #32038 -- Fixed EmptyFieldListFilter crash with GenericRelation.

Thanks Javier Matos Odut for the report.

Backport of e4ab44a4b2ef70be09c35c9197a19fd2e993b4d6 from master

1 files changed, 26 insertions, 0 deletions

diff --git a/tests/admin_filters/tests.py b/tests/admin_filters/tests.py
index 16a7ce495c..cec55f63eb 100644
--- a/tests/admin_filters/tests.py
+++ b/tests/admin_filters/tests.py
@@ -1477,6 +1477,32 @@ class ListFiltersTests(TestCase):
                 queryset = changelist.get_queryset(request)
                 self.assertCountEqual(queryset, expected_result)
 
+    def test_emptylistfieldfilter_genericrelation(self):
+        class BookmarkGenericRelation(ModelAdmin):
+            list_filter = (
+                ('tags', EmptyFieldListFilter),
+            )
+
+        modeladmin = BookmarkGenericRelation(Bookmark, site)
+
+        django_bookmark = Bookmark.objects.create(url='https://www.djangoproject.com/')
+        python_bookmark = Bookmark.objects.create(url='https://www.python.org/')
+        none_tags = Bookmark.objects.create(url='https://www.kernel.org/')
+        TaggedItem.objects.create(content_object=django_bookmark, tag='python')
+        TaggedItem.objects.create(content_object=python_bookmark, tag='python')
+
+        tests = [
+            ({'tags__isempty': '1'}, [none_tags]),
+            ({'tags__isempty': '0'}, [django_bookmark, python_bookmark]),
+        ]
+        for query_string, expected_result in tests:
+            with self.subTest(query_string=query_string):
+                request = self.request_factory.get('/', query_string)
+                request.user = self.alfred
+                changelist = modeladmin.get_changelist_instance(request)
+                queryset = changelist.get_queryset(request)
+                self.assertCountEqual(queryset, expected_result)
+
     def test_emptylistfieldfilter_choices(self):
         modeladmin = BookAdminWithEmptyFieldListFilter(Book, site)
         request = self.request_factory.get('/')