rollback

# File activerecord/lib/active_record/migration.rb, line 346
      def rollback(migrations_path, steps=1)
        migrator = self.new(:down, migrations_path)
        start_index = migrator.migrations.index(migrator.current_migration)
        
        return unless start_index
        
        finish = migrator.migrations[start_index + steps]
        down(migrations_path, finish ? finish.version : 0)
      end