如何編寫一個ruby模塊來允許類定義中的方法

Question

難以解決這個問題。假設我想寫一個模塊，包括時，它將允許類通過調用帶有符號

class Anything 
    include Foo 

    initializers :hello, :goodbye 
end 

module Foo 

    # What goes in here? Its not 
    # def self.initializers(*symbols) 

end 

相同的語法想法attr_accessible的方法來定義方法。試圖在Rails的源找到了，但，以及..

Answer 1

module Foo 

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

    module ClassMethods 
    def initializers *names 
     names.each do |name| 
     define_method name do 
      'ok' 
     end 
     end 
    end 
    end 

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

class Anything 
    include Foo 

    initializers :hello, :goodbye 
end 

puts Anything.new.hello #=> ok 

Answer 2

例如：

module Foo 

    def self.included(base) 
    block = Proc.new do |*symbols| 
     puts symbols.inspect 
    end 
    base.class.send(:define_method, :initializers, block) 
    end 

end 

class Anything 
    include Foo 

    initializers :one, :two , :three 

end