Fixed #28493 -- Made migrations autodetector find dependencies for model renaming.

django/db/migrations/autodetector.py

@@ -468,12 +468,18 @@ class MigrationAutodetector:
                     rem_model_fields_def = self.only_relation_agnostic_fields(rem_model_state.fields)
                     if model_fields_def == rem_model_fields_def:
                         if self.questioner.ask_rename_model(rem_model_state, model_state):
+                            model_opts = self.new_apps.get_model(app_label, model_name)._meta
+                            dependencies = []
+                            for field in model_opts.get_fields():
+                                if field.is_relation:
+                                    dependencies.extend(self._get_dependencies_for_foreign_key(field))
                             self.add_operation(
                                 app_label,
                                 operations.RenameModel(
                                     old_name=rem_model_state.name,
                                     new_name=model_state.name,
-                                )
+                                ),
+                                dependencies=dependencies,
                             )
                             self.renamed_models[app_label, model_name] = rem_model_name
                             renamed_models_rel_key = '%s.%s' % (rem_model_state.app_label, rem_model_state.name)

tests/migrations/test_autodetector.py

@@ -901,6 +901,37 @@ class AutodetectorTests(TestCase):
         self.assertOperationTypes(changes, "testapp", 0, ["RenameModel"])
         self.assertOperationAttributes(changes, "testapp", 0, 0, old_name="EntityB", new_name="RenamedEntityB")
 
+    def test_rename_model_reverse_relation_dependencies(self):
+        """
+        The migration to rename a model pointed to by a foreign key in another
+        app must run after the other app's migration that adds the foreign key
+        with model's original name. Therefore, the renaming migration has a
+        dependency on that other migration.
+        """
+        before = [
+            ModelState('testapp', 'EntityA', [
+                ('id', models.AutoField(primary_key=True)),
+            ]),
+            ModelState('otherapp', 'EntityB', [
+                ('id', models.AutoField(primary_key=True)),
+                ('entity_a', models.ForeignKey('testapp.EntityA', models.CASCADE)),
+            ]),
+        ]
+        after = [
+            ModelState('testapp', 'RenamedEntityA', [
+                ('id', models.AutoField(primary_key=True)),
+            ]),
+            ModelState('otherapp', 'EntityB', [
+                ('id', models.AutoField(primary_key=True)),
+                ('entity_a', models.ForeignKey('testapp.RenamedEntityA', models.CASCADE)),
+            ]),
+        ]
+        changes = self.get_changes(before, after, MigrationQuestioner({'ask_rename_model': True}))
+        self.assertNumberMigrations(changes, 'testapp', 1)
+        self.assertMigrationDependencies(changes, 'testapp', 0, [('otherapp', '__first__')])
+        self.assertOperationTypes(changes, 'testapp', 0, ['RenameModel'])
+        self.assertOperationAttributes(changes, 'testapp', 0, 0, old_name='EntityA', new_name='RenamedEntityA')
+
     def test_fk_dependency(self):
         """Having a ForeignKey automatically adds a dependency."""
         # Note that testapp (author) has no dependencies,