Rails，创建回调

发布于 2024-11-25 16:15:14 字数 637 浏览 0 评论 0原文

我想使用 ActiveModel 回调在对对象进行投票后调用，问题是我正在使用的 gem (voteable_mongo) 使模型可投票在我的应用程序中不提供投票模型或回调，那么我该如何创建回调吗？

set_callback(:vote, :before) do |object|
  object.do_something
end

显然，我编造了投票行动，但我正在使用的 gem 有这个方法，你如何正确扩展这个方法来触发回调？

原文

I want to use an ActiveModel callback to be called after an object has been voted on, the issue is that the gem I'm using (voteable_mongo) to make the model votable doesnt provide like a vote model or callback in my app, so how can I create a callback for it?

set_callback(:vote, :before) do |object|
  object.do_something
end

Obviously that vote action I made up, but the gem I'm using has this method, how would you properly extend this method to trigger a callback?

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。

等你爱我 2024-12-02 16:15:14

将插件示例作为源代码，您可以执行以下操作：

class Post
  include Mongoid::Document
  include Mongo::Voteable
  extend ActiveModel::Callbacks

  define_model_callbacks :vote

  # set points for each vote
  voteable self, :up => +1, :down => -1

  def vote(options, value = nil)
    _run_vote_callbacks do
      super( options, value )
    end
  end

end

我没有运行此代码，因此我不确定这是否能正常工作，但在最坏的情况下，您可以使用 alias_method_chain< 为投票方法添加别名/strong> 或者只是将源代码复制并粘贴到 _run_vote_callbacks 块内（真的非常难看，但无论如何它都是一个解决方案）。

编辑

如果上面的代码不起作用，也可以使用 alias_method_chain 来完成：

class Post
  include Mongoid::Document
  include Mongo::Voteable
  extend ActiveModel::Callbacks

  define_model_callbacks :vote

  # set points for each vote
  voteable self, :up => +1, :down => -1

  alias_method_chain :vote, :callback

  def vote_with_callback(options, value = nil)
    _run_vote_callbacks do
      vote_without_callbacks( options, value )
    end
  end

end

Taking the plugin example as source here's what you could do:

class Post
  include Mongoid::Document
  include Mongo::Voteable
  extend ActiveModel::Callbacks

  define_model_callbacks :vote

  # set points for each vote
  voteable self, :up => +1, :down => -1

  def vote(options, value = nil)
    _run_vote_callbacks do
      super( options, value )
    end
  end

end

I did not run this code so I am not sure if this is going to work correctly or not, but in the worst case you could alias the vote method using alias_method_chain or just copy and paste the source to inside the _run_vote_callbacks block (really, really ugly, but it's a solution anyway).

EDIT

This could also be done using alias_method_chain, if the code above does not work:

class Post
  include Mongoid::Document
  include Mongo::Voteable
  extend ActiveModel::Callbacks

  define_model_callbacks :vote

  # set points for each vote
  voteable self, :up => +1, :down => -1

  alias_method_chain :vote, :callback

  def vote_with_callback(options, value = nil)
    _run_vote_callbacks do
      vote_without_callbacks( options, value )
    end
  end

end

回复收藏 0 原文

~没有更多了~