我可以使用Module＃关于？定义类方法吗？

I'd like to define class method using Module#concerning (https://github.com/37signals/concerning - part of Rails 4.1). This would let me move modules that are used by a single class back into the class.

我想使用Module#related(https://github.com/37signals/concerning - Rails 4.1的一部分)来定义类方法。这样我就可以将单个类使用的模块移回到类中。

However, it seems that I can't define class methods. Given this:

但是,似乎我无法定义类方法。鉴于这种:

class User < ActiveRecord::Base
  attr_accessible :name

  concerning :Programmers do
    module ClassMethods 
      def programmer?
        true
      end
    end
  end

  module Managers 
    extend ActiveSupport::Concern

    module ClassMethods
      def manager?
        true
      end
    end
  end

  include Managers
end

I would expect both these to work:

我希望这两个工作:

User.manager?
User.programmer?

But the second raises

但第二次提出

NoMethodError: undefined method `programmer?' for #<Class:0x007f9641beafd0>

How can I define class methods using Module#concerning?

如何使用Module#关于?定义类方法?

3 个解决方案

#1

https://github.com/basecamp/concerning/pull/2 fixed this:

https://github.com/basecamp/concerning/pull/2解决了这个问题:

class User < ActiveRecord::Base
  concerning :Programmers do
    class_methods do
      def im_a_class_method
        puts "Yes!"
      end
    end
  end
end

Console:

> User.im_a_class_method
Yes!

#2

Try this instead:

试试这个:

concerning :Programmers do
  included do
    def self.programmer?
      true
    end
  end
end

#3

Quick workaround:

concerning :MeaningOfLife do
  included { extend ClassMethods }

  module ClassMethods
      ...
  end

#1