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我正在编写一个需要发送电子邮件的 Rails 4.2.0 应用程序。有人建议我Que使用 gem 来管理后台作业。我已经完成了安装和使用中列出的所有操作

我也在application.rb这些行中指定了:

    # For https://github.com/chanks/que
    config.active_record.schema_format = :sql
    config.active_job.queue_adapter = :que

我的工作是这样的send_welcome_message.rb

class SendWelcomeEmail < Que::Job
  # Default settings for this job. These are optional - without them, jobs
  # will default to priority 100 and run immediately.
  @priority = 10
  @run_at = proc { 1.minute.from_now }

  def run(user_id, options)

    @user = User.find(user_id)
    UserMailer.welcome_email(@user).deliver_now

    # Destroy the job.
    destroy
  end
end

运行rails s命令后,我的控制台将填充这些消息:

{
   "lib":"que",
   "hostname":"...",
   "pid":13938,
   "thread":69925811873800,
   "event":"job_unavailable"
}

当我像这样在控制器中排队我的工作时

SendWelcomeEmail.enqueue 20, priority: 100

并刷新页面,我一直收到以下错误(尽管我可以在不使用 que 的情况下以同步方式发送消息):

    {
   "lib":"que",
   "hostname":"...",
   "pid":13938,
   "thread":69925811873800,
   "event":"job_errored",
   "error":{
      "class":"ArgumentError",
      "message":"wrong number of arguments (1 for 2)"
   },
   "job":{
      "queue":"",
      "priority":100,
      "run_at":"2015-06-22T01:59:45.187+03:00",
      "job_id":11,
      "job_class":"SendWelcomeEmail",
      "args":[
         20
      ],
      "error_count":2
   }
}

当我rails console在第二个终端打开并进入那里Que.worker_states它写在这里,应该返回系统中每个工人的信息)时,我得到了[]

我认为我没有产生任何工人。我对吗?以及如何解决?

更新

在 que 日志中发现错误:

wrong number of arguments (1 for 2)
/home/username/train/project/app/jobs/send_welcome_email.rb:8:in `run'
/home/username/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/que-0.10.0/lib/que/job.rb:15:in `_run'
/home/username/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/que-0.10.0/lib/que/job.rb:99:in `block in work'
/home/username/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/que-0.10.0/lib/que/adapters/active_record.rb:5:in `block in checkout'
/home/username/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:292:in `with_connection'
/home/username/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/que-0.10.0/lib/que/adapters/active_record.rb:34:in `checkout_activerecord_adapter'
/home/username/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/que-0.10.0/lib/que/adapters/active_record.rb:5:in `checkout'
/home/username/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/que-0.10.0/lib/que/job.rb:82:in `work'
/home/username/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/que-0.10.0/lib/que/worker.rb:78:in `block in work_loop'
/home/username/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/que-0.10.0/lib/que/worker.rb:73:in `loop'
/home/username/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/que-0.10.0/lib/que/worker.rb:73:in `work_loop'
/home/username/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/que-0.10.0/lib/que/worker.rb:17:in `block in initialize'

第 8 行是:

def run(user_id, options)

解决方案

现在它的工作。我已经删除了适配器配置application.rb并代替

SendWelcomeEmail.enqueue 20, priority: 100

写了

@user = User.find(20)
SendWelcomeEmail.enqueue  @user.id, :priority => 100

现在它的作品。第二个变体中有趣的事情是将相同的值传递给函数。仍然错误消息说run只获得了 1 个参数 - 20

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1 回答 1

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阅读quegem,看起来该enqueue方法将priority关键字视为特殊情况:https ://github.com/chanks/que/blob/master/lib/que/job.rb#L31

所以,你的run方法只传递了第一个参数。关键字priority被.que

run将您的方法更改为

  def run(user_id)

应该解决您的问题。

于 2015-06-22T07:17:10.963 回答