Ticket #30591: ticket-30591.diff

tests/migrations/test_operations.py

@@ -1458 +1458 @@
             operation.database_backwards("test_alflpkfk", editor, new_state, project_state)
         assertIdTypeEqualsFkType()
 
+    @skipUnlessDBFeature('supports_foreign_keys')
+    def test_alter_field_reloads_state_on_fk_with_to_field_target_type_change(self):
+        app_label = 'alter_alter_field_reloads_state_on_fk_with_to_field_target_type_change'
+        project_state = self.apply_operations(app_label, ProjectState(), operations=[
+            migrations.CreateModel('Rider', fields=[
+                ('id', models.AutoField(primary_key=True)),
+                ('code', models.PositiveIntegerField(unique=True)),
+            ]),
+            migrations.CreateModel('Pony', fields=[
+                ('id', models.AutoField(primary_key=True)),
+                ('rider', models.ForeignKey('%s.Rider' % app_label, models.CASCADE, to_field='code')),
+            ]),
+        ])
+        project_state = self.apply_operations(app_label, project_state, operations=[
+            migrations.AlterField('Rider', 'code', models.CharField(max_length=100, unique=True)),
+        ])
+
+    @skipUnlessDBFeature('supports_foreign_keys')
+    def test_alter_field_reloads_state_on_fk_with_to_field_related_name_target_type_change(self):
+        app_label = 'alter_alter_field_reloads_state_on_fk_with_to_field_related_name_target_type_change'
+        project_state = self.apply_operations(app_label, ProjectState(), operations=[
+            migrations.CreateModel('Rider', fields=[
+                ('id', models.AutoField(primary_key=True)),
+                ('code', models.PositiveIntegerField(unique=True)),
+            ]),
+            migrations.CreateModel('Pony', fields=[
+                ('id', models.AutoField(primary_key=True)),
+                ('rider', models.ForeignKey('%s.Rider' % app_label, models.CASCADE, to_field='code', related_name='+')),
+            ]),
+        ])
+        project_state = self.apply_operations(app_label, project_state, operations=[
+            migrations.AlterField('Rider', 'code', models.CharField(max_length=100, unique=True)),
+        ])
+
     def test_alter_field_reloads_state_on_fk_target_changes(self):
         """
         If AlterField doesn't reload state appropriately, the second AlterField