move

# File activerecord/lib/active_record/migration.rb, line 475
      def move(direction, migrations_path, steps)
        migrator = self.new(direction, migrations_path)
        start_index = migrator.migrations.index(migrator.current_migration)

        if start_index
          finish = migrator.migrations[start_index + steps]
          version = finish ? finish.version : 0
          send(direction, migrations_path, version)
        end
      end