让 ActiveModel::Callbacks 与 ActiveResource 一起使用

发布于 2025-01-05 01:23:03 字数 423 浏览 3 评论 0原文

我正在尝试让 ActiveModel::Callbacks 与 Rails 3 应用程序的 ActiveResource （特别是 after_initialize）一起使用，但我似乎无法让它工作。我没有收到任何错误，但回调方法从未执行。

这是一段代码

class User < ActiveResource::Base
  extend ActiveModel::Callbacks
  define_model_callbacks :initialize, :only => :after

  after_initialize :update_info

  def update_info
    puts 'info'
  end 
end

由于某种原因， update_info 永远不会被执行。有人知道如何让它发挥作用吗？

原文

I am trying to get ActiveModel::Callbacks to work with ActiveResource (specifically after_initialize) for a Rails 3 app, but I can't seem to get it to work. I don't get any errors, but the callback method is never executed.

Here is a snippet of code

class User < ActiveResource::Base
  extend ActiveModel::Callbacks
  define_model_callbacks :initialize, :only => :after

  after_initialize :update_info

  def update_info
    puts 'info'
  end 
end

For some reason, the update_info is never executed. Anyone have any idea how to get this to work?

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下雨或天晴 2025-01-12 01:23:03

如果有人感兴趣，我重新阅读了有关此的文档，我认为是对代码如何在幕后工作的解释，结果是一个要求，表明我需要重写我添加回调的方法to：

def initialize(attributes = {}, persisted = false)
  run_callbacks :initialize do
    super(attributes, persisted)
  end
end

这对我来说似乎非常违反直觉，因为它希望您追踪现有方法的签名，覆盖它并添加回调功能。我希望我在这里遗漏了一些东西，并且只是犯了一个错误，但我还没有找到任何其他解决方案。

无论如何，这里有一个猴子补丁，可以为所有 AR 类提供此回调：

module ActiveResource
  class Base    
    extend ActiveModel::Callbacks
    define_model_callbacks :initialize, :only => :after

    def initialize_with_callback(attributes = {}, persisted = false)
      run_callbacks :initialize do
        initialize_without_callback(attributes, persisted)
      end
    end
    alias_method_chain :initialize, :callback
  end
end

In case anyone is interested, I re-read the documentation on this, and what I thought was an explanation of how the code worked under the covers, turned out to be a requirement which stated that I needed to override the method I was adding callbacks to:

def initialize(attributes = {}, persisted = false)
  run_callbacks :initialize do
    super(attributes, persisted)
  end
end

This seems incredibly counter-intuitive to me, as it expects you to track down the signature of the existing method, overwrite it, and add the callback functionality. I hope I am missing something here, and simply making a mistake, but I haven't gotten any other solution to work.

Anyways, here is a monkey patch to provide this callback to all AR classes:

module ActiveResource
  class Base    
    extend ActiveModel::Callbacks
    define_model_callbacks :initialize, :only => :after

    def initialize_with_callback(attributes = {}, persisted = false)
      run_callbacks :initialize do
        initialize_without_callback(attributes, persisted)
      end
    end
    alias_method_chain :initialize, :callback
  end
end

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