[1.7.x] Fixed #23503 -- Fixed renaming of model with self-referential m2m field.

Backport of 463952d940 from master

django/db/backends/schema.py

@@ -734,6 +734,12 @@ class BaseDatabaseSchemaEditor(object):
             old_field.rel.through._meta.get_field_by_name(old_field.m2m_reverse_field_name())[0],
             new_field.rel.through._meta.get_field_by_name(new_field.m2m_reverse_field_name())[0],
         )
+        self.alter_field(
+            new_field.rel.through,
+            # for self-referential models we need to alter field from the other end too
+            old_field.rel.through._meta.get_field_by_name(old_field.m2m_field_name())[0],
+            new_field.rel.through._meta.get_field_by_name(new_field.m2m_field_name())[0],
+        )
 
     def _create_index_name(self, model, column_names, suffix=""):
         """

docs/releases/1.7.1.txt

@@ -58,3 +58,6 @@ Bugfixes
 
 * Added quoting of constraint names in the SQL generated by migrations to
   prevent crash with uppercase characters in the name (:ticket:`23065`).
+
+* Fixed renaming of models with a self-referential many-to-many field
+  (``ManyToManyField('self')``) (:ticket:`23503`).

tests/migrations/test_operations.py

@@ -472,6 +472,22 @@ class OperationTests(OperationTestBase):
             self.assertFKExists("test_rmwsrf_rider", ["friend_id"], ("test_rmwsrf_rider", "id"))
             self.assertFKNotExists("test_rmwsrf_rider", ["friend_id"], ("test_rmwsrf_horserider", "id"))
 
+    def test_rename_model_with_self_referential_m2m(self):
+        app_label = "test_rename_model_with_self_referential_m2m"
+
+        project_state = self.apply_operations(app_label, ProjectState(), operations=[
+            migrations.CreateModel("ReflexivePony", fields=[
+                ("ponies", models.ManyToManyField("self")),
+            ]),
+        ])
+        project_state = self.apply_operations(app_label, project_state, operations=[
+            migrations.RenameModel("ReflexivePony", "ReflexivePony2"),
+        ])
+        apps = project_state.render()
+        Pony = apps.get_model(app_label, "ReflexivePony2")
+        pony = Pony.objects.create()
+        pony.ponies.add(pony)
+
     def test_add_field(self):
         """
         Tests the AddField operation.