Method database_backwards

django/db/migrations/operations/fields.py:247–248

(self, app_label, schema_editor, from_state, to_state)

                to_field.default = NOT_PROVIDED

    def database_backwards(self, app_label, schema_editor, from_state, to_state):
        self.database_forwards(app_label, schema_editor, from_state, to_state)

    def describe(self):
        return "Alter field %s on %s" % (self.name, self.model_name)