如何在ruby中编写包含method_missing的模块

module SaysHello
    def respond_to?(method)
        super.respond_to?(method) || !!(method.to_s =~ /^hello/)
    end
    def method_missing(method,*args,&block)
        if (method.to_s =~ /^hello/)
            puts "Hello,#{method}"
        else
            super.method_missing(method,&block)
        end
    end
end

module SaysGoodbye
    def respond_to?(method)
        super.respond_to?(method) || !!(method.to_s =~ /^goodbye/)
    end
    def method_missing(method,&block)
        if (method.to_s =~ /^goodbye/)
            puts "Goodbye,&block)
        end
    end
end

class ObjectA
    include SaysHello
end

class ObjectB
    include SaysGoodbye
end

这一切都运行良好,例如ObjectA.new.hello_there输出“Hello,hello_there”.同样,ObjectB.new.goodbye_xxx输出“Goodbye,xxx”.回应？也有效,例如ObjectA.new.respond_to？ ：hello_there返回true.

但是,当您想同时使用SaysHello和SaysGoodbye时,这种方法效果不佳：

class ObjectC
    include SaysHello
    include SaysGoodbye
end

当ObjectC.new.goodbye_aaa正常工作时,ObjectC.new.hello_a表现得很奇怪：

> ObjectC.new.hello_aaa
Hello,hello_aaa
NoMethodError: private method `method_missing' called for nil:NilClass
    from test.rb:22:in `method_missing' (line 22 was the super.method_missing line in the SaysGoodbye module)

它正确输出,然后抛出错误.还是respond_to？不正确,ObjectC.new.respond_to？ ：hello_a返回false.

最后,添加这个类：

class ObjectD
    include SaysHello
    include SaysGoodbye

    def respond_to?(method)
        super.respond_to?(method) || !!(method.to_s =~ /^lol/)
    end


    def method_missing(method,&block)
        if (method.to_s =~ /^lol/)
            puts "Haha,&block)
        end
    end
end

也行为奇怪. ObjectD.new.lol_zzz工作,但ObjectD.new.hello_a和ObjectD.new.goodbye_t在输出正确的字符串后都抛出一个名称异常.回应？你好和再见的方法也失败了.

有没有办法让这一切正常工作？解释method_missing,Modules和super如何交互也非常有用.

编辑：coreyward解决了这个问题,如果我在我定义的所有方法中使用super而不是super.< method-name>(args …),程序可以正常工作.我不明白为什么会这样,所以我在What does super.<method-name> do in ruby?问了另一个问题