使用“has_many"扩展插件中的模型使用模块 [英] Extend model in plugin with "has_many" using a module

问题描述

我在包含一些模型的引擎样式插件中有一些代码.在我的应用程序中，我想扩展这些模型之一.通过在初始化程序中包含一个模块，我设法将实例和类方法添加到相关模型中.

I have a some code in an engine style plugin which includes some models. In my app I want to extend one of these models. I have managed to add both instance and class methods to the model in question by including a module from within an initializer.

但是我似乎无法添加关联、回调等.我收到找不到方法"错误.

However I cannot seem to add associations, callbacks etc. I get a 'method not found' error.

/libs/qwerty/core.rb

/libs/qwerty/core.rb

module Qwerty
  module Core
    module Extensions

      module User
        # Instance Methods Go Here 

        # Class Methods
        module ClassMethods
          has_many  :hits, :uniq => true # no method found

          before_validation_on_create :generate_code # no method found

          def something # works!
            "something"
          end
        end

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

/initializers/qwerty.rb

/initializers/qwerty.rb

require 'qwerty/core/user'

User.send :include, Qwerty::Core::Extensions::User

推荐答案

我认为这应该可行

module Qwerty
  module Core
    module Extensions
      module User
      # Instance Methods Go Here 

        # Class Methods
        module ClassMethods
          def relate
            has_many  :hits, :uniq => true # no method found

            before_validation_on_create :generate_code # no method found
          end

          def something # works!
            "something"
          end
        end

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

旧代码错误导致在模块加载时调用验证和关联，并且该模块对ActiveRecord一无所知.这是 Ruby 的一个通用方面，加载时直接调用类或模块主体内的代码.你不想那样.要解决这个问题，您可以使用上述解决方案.

The old code is wrong cause the validation and the association are called upon module loading, and this module knows nothing about ActiveRecord. That's a general aspect of Ruby, code inside class or module bodies is called directly when loaded. You don't want that. To get around that you can use the above solution.

这篇关于使用“has_many"扩展插件中的模型使用模块的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！