ruby-on-rails - 如何在实际作业中引用事件的延迟作业

Question

我正在研究显示延迟作业完成百分比的解决方案(使用 delay_job gem)。目前，我有一个数据库迁移，对于我的 delay_jobs 表，如下所示:

class CreateDelayedJobs < ActiveRecord::Migration
  def self.up
    create_table :delayed_jobs, :force => true do |table|
      table.integer  :priority, :default => 0      # Allows some jobs to jump to the front of the queue
      table.integer  :attempts, :default => 0      # Provides for retries, but still fail eventually.
      table.text     :handler                      # YAML-encoded string of the object that will do work
      table.text     :last_error                   # reason for last failure (See Note below)
      table.datetime :run_at                       # When to run. Could be Time.zone.now for immediately, or sometime in the future.
      table.datetime :locked_at                    # Set when a client is working on this object
      table.datetime :failed_at                    # Set when all retries have failed (actually, by default, the record is deleted instead)
      table.string   :locked_by                    # Who is working on this object (if locked)
      table.string   :queue                        # The name of the queue this job is in
      table.integer  :progress
      table.timestamps

    end

    add_index :delayed_jobs, [:priority, :run_at], :name => 'delayed_jobs_priority'
  end

  def self.down
    drop_table :delayed_jobs
  end
end

我在延迟作业的 Controller 方法中使用排队进程，并在 lib/build_detail.rb 中引用一个类:

Delayed::Job.enqueue(BuildDetail.new(@object, @com))

lib/build_detail.rb 文件如下:

class BuildDetail < Struct.new(:object, :com)

  def perform
    total_count = object.person_ids.length
    progress_count = 0

    people = com.person object.person_ids do |abc|
      progress_count += abc.size
      Delayed::Job.current.update_attribute :progress, (progress_count/total_count)
    end
  end  

end

Delayed::Job.current 不起作用。我看到了 this posting 上提出的 Delayed::Job.current 方法，但是看起来该方法从未包含在主要的delayed_jobs github项目中。

我如何访问当前工作(从实际工作中)，以在每次我的工作通过循环时更新进度字段？

Answer 1

现在回答为时已晚，但我遇到了同样的要求，因此可能会对某人有所帮助。
您需要做的就是实现自定义作业和 before -hook 您将在当前工作中存储引用的位置:

class MyTestJob
  def before(job)
    @job = job
  end

  def perform
    ...
    @job.update_attributes({ progress: your_progress_var }, without_protection: true)
  end
end