migrate() public

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# File activerecord/lib/active_record/migration.rb, line 903
    def migrate
      if !target && @target_version && @target_version > 0
        raise UnknownMigrationVersionError.new(@target_version)
      end

      running = runnable

      if block_given?
        message = "block argument to migrate is deprecated, please filter migrations before constructing the migrator"
        ActiveSupport::Deprecation.warn message
        running.select! { |m| yield m }
      end

      running.each do |migration|
        Base.logger.info "Migrating to #{migration.name} (#{migration.version})" if Base.logger

        begin
          execute_migration_in_transaction(migration, @direction)
        rescue => e
          canceled_msg = use_transaction?(migration) ? "this and " : ""
          raise StandardError, "An error has occurred, #{canceled_msg}all later migrations canceled:\n\n#{e}", e.backtrace
        end
      end
    end
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