了解method_added的类方法

Question

我想在当前实例中添加一些魔法，并将类方法添加到某些类中。因此，我尝试了以下方法：

module Magic 
    def self.included(base) 
    base.extend ClassMethods 
    end 
    module ClassMethods 
    def method_added(name) 
     puts "class method '#{name}' added" 
    end 
    def some_class_method 
     puts "some class method" 
    end 
    end 
end 

class Foo 
    include Magic 
    def self.method_added(name) 
    puts "instance method #{name} added" 
    end 
end 

此方法适用于实例方法，对类方法失败。我该如何解决这个问题？有什么建议么？

Answer 1

您正在寻找singleton_method_added：

module Magic 
    def self.included(base) 
    base.extend ClassMethods 
    end 
    module ClassMethods 
    def method_added(name) 
     puts "instance method '#{name}' added" 
    end 

    def singleton_method_added(name) 
     puts "class method '#{name}' added" 
    end 
    end 
end 

class Foo 
    include Magic 

    def bla 
    end 

    def blubb 
    end 

    def self.foobar 
    end 
end 

输出：

instance method 'bla' added 
instance method 'blubb' added 
class method 'foobar' added 

享受！