Fixed #31357 -- Fixed get_for_models() crash for stale content types when model with the same name exists in another app.

1 files changed, 20 insertions, 0 deletions

diff --git a/tests/contenttypes_tests/test_models.py b/tests/contenttypes_tests/test_models.py
index e2fb7fe818..a96e12e69f 100644
--- a/tests/contenttypes_tests/test_models.py
+++ b/tests/contenttypes_tests/test_models.py
@@ -248,6 +248,26 @@ class ContentTypesTests(TestCase):
         ct_fetched = ContentType.objects.get_for_id(ct.pk)
         self.assertIsNone(ct_fetched.model_class())
 
+    def test_missing_model_with_existing_model_name(self):
+        """
+        Displaying content types in admin (or anywhere) doesn't break on
+        leftover content type records in the DB for which no model is defined
+        anymore, even if a model with the same name exists in another app.
+        """
+        # Create a stale ContentType that matches the name of an existing
+        # model.
+        ContentType.objects.create(app_label="contenttypes", model="author")
+        ContentType.objects.clear_cache()
+        # get_for_models() should work as expected for existing models.
+        cts = ContentType.objects.get_for_models(ContentType, Author)
+        self.assertEqual(
+            cts,
+            {
+                ContentType: ContentType.objects.get_for_model(ContentType),
+                Author: ContentType.objects.get_for_model(Author),
+            },
+        )
+
     def test_str(self):
         ct = ContentType.objects.get(app_label="contenttypes_tests", model="site")
         self.assertEqual(str(ct), "contenttypes_tests | site")