表明该延迟作业已完成一个ajax过程 [英] Indicate to an ajax process that the delayed job has completed

问题描述

我有一个Rails 3应用程序，使用delayed_job的获取一些数据（一类方法），当用户点击该页面。 我怎么能指示该类方法运行（这样我就可以停止轮询）的AJAX程序？

I have a Rails 3 app that uses delayed_job to fetch some data (with a class method) when the user hits the page. How can I indicate to the ajax process that the class method has run (so that I can stop polling)?

编辑：

要澄清一下，我想知道什么时候的delayed_job已经运行，而不是当AJAX过程已成功完成。然后，我想通过完成状态到正在运行的AJAX过程中的delayed_job的。

To clarify, I want to know when the delayed_job has run, not when the ajax process has succeeded. Then I want to pass the delayed_job completed status to the running ajax process.

推荐答案

通常情况下，要做到这一点的最好办法是存储在数据库中，作业进度的指示。例如：

Typically, the best way to do this is to store, in your database, an indication of the job's progress. For instance:

class User
  def perform_calculation
    begin
      self.update_attributes :calculation_status => 'started'
      do_something_complex
      self.update_attributes :calculation_status => 'success' 
    rescue Exception => e
      self.update_attributes :calculation_status => 'error'
    end
  end
end

所以，当你排队的任务：

So that when you enqueue the job:

User.update_attributes :calculation_status => 'enqueued'
User.send_later :perform_calculation

您可以查询，在你的控制器，该作业的状态：

You can query, in your controller, the status of the job:

def check_status
  @user = User.find(params[:id])
  render :json => @user.calculation_status
end

然后，您查询阿贾克斯过程可以简单地调用check_status看到作业进展如何，如果它成功了，或者如果它已经失败。

You polling ajax process can then simply call check_status to see how the job is progressing, if it has succeeded or if it has failed.

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