覆盖 Rails 3 中的范围

发布于 2024-09-28 16:32:54 字数 578 浏览 6 评论 0原文

我想覆盖现有范围以向其添加额外条件。我已经尝试使用 alias_method 来执行此操作。不幸的是，这种方法不适用于范围，我收到未定义的方法错误。我该如何使用示波器来做到这一点？

module Delayed
  module Backend
    module ActiveRecord
      class Job < ::ActiveRecord::Base
        belongs_to :queue

        scope :in_unlocked_queue, lambda {
          joins(:queue) & Queue.unlocked
        }

        alias_method :orig_ready_to_run, :ready_to_run
        scope :ready_to_run, lambda {|worker_name, max_run_time|
          orig_ready_to_run(worker_name, max_run_time).in_unlocked_queue
        }
      end
    end
  end
end

原文

I want to override an existing scope to add an extra condition to it. I've shown my attempt to do this using alias_method. Unfortunately this approach doesn't work with scopes, I get an undefined method error. How do I do it with scopes?

module Delayed
  module Backend
    module ActiveRecord
      class Job < ::ActiveRecord::Base
        belongs_to :queue

        scope :in_unlocked_queue, lambda {
          joins(:queue) & Queue.unlocked
        }

        alias_method :orig_ready_to_run, :ready_to_run
        scope :ready_to_run, lambda {|worker_name, max_run_time|
          orig_ready_to_run(worker_name, max_run_time).in_unlocked_queue
        }
      end
    end
  end
end

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

青衫负雪 2024-10-05 16:32:54

好的，这是一个答案，不确定它是否是最干净的，但它有效

require 'delayed_job'

module Delayed
  module Backend
    module ActiveRecord
      class Job < ::ActiveRecord::Base
        belongs_to :queue

        scope :in_unlocked_queue, lambda {
          joins(:queue) & Queue.unlocked
        }

        scope :orig_ready_to_run, scopes[:ready_to_run]
        scope :ready_to_run, lambda {|worker_name, max_run_time|
          orig_ready_to_run(worker_name, max_run_time).in_unlocked_queue
        }
      end
    end
  end
end

OK, here's an answer, not sure if it's the cleanest but it works

require 'delayed_job'

module Delayed
  module Backend
    module ActiveRecord
      class Job < ::ActiveRecord::Base
        belongs_to :queue

        scope :in_unlocked_queue, lambda {
          joins(:queue) & Queue.unlocked
        }

        scope :orig_ready_to_run, scopes[:ready_to_run]
        scope :ready_to_run, lambda {|worker_name, max_run_time|
          orig_ready_to_run(worker_name, max_run_time).in_unlocked_queue
        }
      end
    end
  end
end

回复收藏 0 原文

~没有更多了~