migrate

# File activerecord/lib/active_record/migration.rb, line 782
      def migrate(migrations_paths, target_version = nil, &block)
        case
        when target_version.nil?
          up(migrations_paths, target_version, &block)
        when current_version == 0 && target_version == 0
          []
        when current_version > target_version
          down(migrations_paths, target_version, &block)
        else
          up(migrations_paths, target_version, &block)
        end
      end