Activerecord 如何在Rails5中的rake任务中调用迁移

在Rails5中，我不再能够使用rake任务迁移不同目录中的文件。我得到的错误是：版本号为20180209214145的未迁移

你知道我如何在Rails 5中做到这一点吗？我认为行

ActiveRecord:：Migrator.migrations\u path=['db/manual\u migrate']

不再像预期的那样工作，但我不太确定如何修复它

  desc 'Run db:migrate:up on a task we wish to migrate manually (e.g. not on all servers).' \
    'VERSION is required.'
  task manual_migrate: [:environment, :load_config] do
    raise 'VERSION of migration is required for this task!' unless ENV['VERSION']
    default_paths = ActiveRecord::Migrator.migrations_paths
    ActiveRecord::Migrator.migrations_paths = ['db/manual_migrate']
    begin
      Rake::Task['db:migrate:up'].invoke
    ensure
      ActiveRecord::Migrator.migrations_paths = default_paths
    end
  end