包括控制器中的模块 [英] including Modules in controller

问题描述

我在 ruby​​ on rails 应用程序的 lib 目录中做了一个模块就像

I have done a module in lib directory in ruby on rails application its like

module Select  

  def self.included(base)
    base.extend ClassMethods
  end 

 module ClassMethods

    def select_for(object_name, options={})

       #does some operation
      self.send(:include, Selector::InstanceMethods)
    end
  end

我在像这样的控制器中调用它

I called this in a controller like

include Selector

  select_for :organization, :submenu => :general

但我想在函数中调用它即

but I want to call this in a function i.e

 def select
  #Call the module here 
 end

推荐答案

让我们澄清一下:您在模块中定义了一个方法，并且您希望在实例方法中使用该方法.

Let's clarify: You have a method defined in a module, and you want that method to be used in an instance method.

class MyController < ApplicationController
  include Select

  # You used to call this in the class scope, we're going to move it to
  # An instance scope.
  #
  # select_for :organization, :submenu => :general

  def show # Or any action
    # Now we're using this inside an instance method.
    #
    select_for :organization, :submenu => :general

  end

end

我将稍微更改您的模块.这使用 include 而不是 extend.extend 用于添加类方法，include 用于添加实例方法:

I'm going to change your module slightly. This uses include instead of extend. extend is for adding class methods, and include it for adding instance methods:

module Select  

  def self.included(base)
    base.class_eval do
      include InstanceMethods
    end
  end 

  module InstanceMethods

    def select_for(object_name, options={})
       # Does some operation
      self.send(:include, Selector::InstanceMethods)
    end

  end

end

那会给你一个实例方法.如果需要实例方法和类方法，只需添加 ClassMethods 模块，并使用 extend 而不是 include:

That will give you an instance method. If you want both instance and class methods, you just add the ClassMethods module, and use extend instead of include:

module Select  

  def self.included(base)
    base.class_eval do
      include InstanceMethods
      extend  ClassMethods
    end
  end 

  module InstanceMethods

    def select_for(object_name, options={})
       # Does some operation
      self.send(:include, Selector::InstanceMethods)
    end

  end

  module ClassMethods

    def a_class_method
    end

  end

end

这能解决问题吗?在您的示例中，您将模块定义为 Select 但在控制器中包含 Selector...我只是在我的代码中使用了 Select.

Does that clear things up? In your example you defined a module as Select but included Selector in your controller...I just used Select in my code.

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