作业只工作一次，然后返回错误

Question

我正在创建一个后台工作，其工作主要是等待用户响应。然后根据他们的回复做一些动作。

class AwaitDriverReply
  include Sidekiq::Worker
  sidekiq_options retry: false

  def perform(order_id)
    ActiveRecord::Base.connection_pool.with_connection do
      order = Order.find_by(id: order_id)
      10.times do
        if order.accepted == true
          puts "driver confirmed"
          break
        elsif order.accepted == false
          puts "driver has declined"
          break
        else
          puts "awaiting response"
          sleep(1)
        end
      end
    end
  end

end

我必须睡觉的原因是因为用户可以在不同时间明显回答，并且这个等待≈10秒。现在这是我第一次运行这个工作时的完美工作，然后如果我尝试重复它，那么作业会返回一个错误，我无法调试：

2016-02-22T16:34:52.096Z 1431 TID-ovpfin8kg WARN: NoMethodError: undefined method `accepted' for nil:NilClass
2016-02-22T16:34:52.096Z 1431 TID-ovpfin8kg WARN: /Users/Sebastian/workspace/ex/app/jobs/await_driver_reply.rb:11:in `block (2 levels) in perform'
/Users/Sebastian/workspace/ex/app/jobs/await_driver_reply.rb:10:in `times'
/Users/Sebastian/workspace/ex/app/jobs/await_driver_reply.rb:10:in `block in perform'
/Users/Sebastian/.rvm/gems/ruby-2.3.0-preview2/gems/activerecord-5.0.0.beta2/lib/active_record/connection_adapters/abstract/connection_pool.rb:398:in `with_connection'
/Users/Sebastian/workspace/ex/app/jobs/await_driver_reply.rb:6:in `perform'

并返回nil接受的未定义方法，这通常意味着订单不存在。但是我添加了puts来检查订单，它就在那里。