猴子补丁魔法（或任何Rails宝石） [英] Monkey patching Devise (or any Rails gem)

问题描述

我在我的Rails项目中使用 Devise 认证宝石，而我想更改密钥它在闪光警报中使用。 （Devise使用：通知和：提醒flash键，但是我想将它们更改为：success和：错误，以便我可以使用 Bootstrap 。）

所以我想以某种方式覆盖 set_flash_message 方法在 DeviseController 。

这是新的方法：

  def set_flash_message（key ，kind，options = {}）
 
如果key =='alert'
 key ='error'
 elsif key =='notice'
 key ='成功'
 end 
 
 message = find_message（kind，options）
 flash [key] = message if message.present？ 
 
 end 
  

但我只是不知道在哪里放。

---

更新：

根据答案，我创建了一个配置/ initializers / overrides.rb文件，其代码如下：

  class DeviseController 
 def set_flash_message（key，kind，options = {}）
如果key =='alert'
 key ='error'
 elsif key =='notice'
 key ='成功'
 end 
 message = find_message（kind，options）
 flash [key] = message if message.present？ 
 end 
 end 
  

但是这会导致每个Devise操作发生错误： / p>

路由错误：未定义的方法'prepend_before_filter'为
Devise :: SessionsController：Class

< blockquote>

解决方案

如果您尝试重新打开一个类，它与声明新类的语法相同：

  class DeviseController 
 end 
  

如果这个代码在真正的类声明之前执行，它将继承自Object而不是扩展Devise声明的类。相反，我尝试使用以下

  DeviseController.class_eval do 
＃您的新方法
 end 
  

这样一来，如果 DeviseController 尚未声明。因此，您最终可能会遇到

  require'devise / app / controllers / devise_controller'
 
 DeviseController.class_eval do 
＃您的新方法
 end 
  

I'm using the Devise authentication gem in my Rails project, and I want to change the keys it's using in flash alerts. (Devise uses :notice and :alert flash keys, but I want to change them to :success and :error so that I can display nice green/red boxes with Bootstrap.)

So I want to be able to somehow override the set_flash_message method in DeviseController.

Here's the new method:

def set_flash_message(key, kind, options = {})

  if key == 'alert'
    key = 'error'
  elsif key == 'notice'
    key = 'success'
  end

  message = find_message(kind, options)
  flash[key] = message if message.present?

end

But I just don't know where to put it.

---

UPDATE:

Based on an answer I created a config/initializers/overrides.rb file with the following code:

class DeviseController
    def set_flash_message(key, kind, options = {})
       if key == 'alert'
          key = 'error'
       elsif key == 'notice'
          key = 'success'
       end
       message = find_message(kind, options)
       flash[key] = message if message.present?
    end
end

But this causes an error on every Devise action:

Routing Error: undefined method 'prepend_before_filter' for Devise::SessionsController:Class

解决方案

If you try to reopen a class, it's the same syntax as declaring a new class:

class DeviseController
end

If this code is executed before the real class declaration, it inherits from Object instead of extending the class declared by Devise. Instead I try to use the following

DeviseController.class_eval do
  # Your new methods here
end

This way, you'll get an error if DeviseController has not been declared. As a result, you'll probably end up with

require 'devise/app/controllers/devise_controller'

DeviseController.class_eval do
  # Your new methods here
end

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