Method database_backwards

django/db/migrations/operations/models.py:401–404

(self, app_label, schema_editor, from_state, to_state)

            schema_editor.delete_model(model)

    def database_backwards(self, app_label, schema_editor, from_state, to_state):
        model = to_state.apps.get_model(app_label, self.name)
        if self.allow_migrate_model(schema_editor.connection.alias, model):
            schema_editor.create_model(model)

    def references_model(self, name, app_label):
        # The deleted model could be referencing the specified model through