From: nobu.nokada@...
Date: 2002-12-19T03:50:23+09:00
Subject: Re: Mommy, where do methods come from?

Hi,

At Thu, 19 Dec 2002 03:05:20 +0900,
Chris Pine wrote:
> Is there a way to tell in which module an object's method was defined?
> 
> For example:
> 
>   class Foo
>     def to_s; 'foo'; end
>   end
> 
>   class Bar; end
> 
>   foo = Foo.new
>   bar = Bar.new

    module Kernel
      def methodClass(m)
        m = "#{m}"
        self.class.ancestors.find {|c| c.instance_methods.include?(m)}
      end
    end

>   foo.methodClass :to_s  #  Hopefully returns Foo.
>   bar.methodClass :to_s  #  Hopefully returns Object.

But bar.to_s is defined in Kernel.

Once method of Method returns original class was proposed, but
wasn't accepted because of its name.

> Furthermore, is there a way to tell all of the modules which did define a
> method for a given object?
> 
>   foo.methodClasses :to_s  #  Hopefully returns [Foo, Object].

Replace find with find_all in above.

> Finally (and I'm sure I should know this one already), how would I call
> Object#to_s on foo if I have already redefined to_s?  (Is this even
> possible?)

Impossible outside redefined to_s, unless it's aliased.

-- 
Nobu Nakada