From: "David A. Black" <dblack@...>
Date: 2004-11-01T05:02:23+09:00
Subject: Re: undef_method cutting off subclass's method lookup?

Hi --

On Mon, 1 Nov 2004, trans.  (T. Onoma) wrote:

> 
>   class Numeric
>     def succ
>       self + 1
>     end
>   end
> 
>   class Integer
>     undef_method( :succ )
>   end
> 
>   2.class  #=> Fixnum
>   2.succ
>   NoMethodError: undefined method `succ' for 1:Fixnum
>           from (irb):10
> 
> 
> Shouldn't it be able to find #succ in the ancestor?

From 'ri undef_method':

----------------------------------------------------
Module#undef_method
     undef_method(symbol)    => self
------------------------------------------------------------------------
     Prevents the current class from responding to calls to the named
     method. Contrast this with +remove_method+, which deletes the
     method from the particular class; Ruby will still search
     superclasses and mixed-in modules for a possible receiver.


David

-- 
David A. Black
dblack@wobblini.net