# File lib/dm-migrations/auto_migration.rb, line 158
      def auto_migrate_down!(repository_name = self.repository_name)
        assert_valid(true)
        base_model = self.base_model
        if base_model == self
          repository(repository_name).destroy_model_storage(self)
        else
          base_model.auto_migrate_down!(repository_name)
        end
      end