From: Stefano Crocco <stefano.crocco@...>
Date: 2006-11-17T01:43:06+09:00
Subject: Re: Accessing base method...

Soso Soso wrote:
> Hi all,
> 
> I'm new to ruby, being trying to access base class method but with no 
> luck until now. Here's a snippet to get an idea:
> 
> 
> class Parent
>   def knox
>     puts 'parent'
>   end
> end
> 
> class Child < Parent
>   def knox
>     puts 'child'
>   end
>   def test
>     knox # here I want to call knox method from Parent class... ??
>   end
> end
> 
> Thanks,
> -soso

If you want to be able to call a base class's method after having 
overriden it, you should use alias_method. It's an instance method of 
class Module (and so it can be used within a class definition), which 
makes a copy of the given method with a new name. You should use it this 
way:

class Child < Parent

   alias_method :parent_knox, :knox

   def knox
     puts 'child'
   end
   def test
     parent_knox
     knox # here I want to call knox method from Parent class... ??
   end
end

If you need to call the parent's method in the method which is 
overriding it, instead (in your case in the body of Child's knox 
method), you do so using the super keyword:

class Child <Parent
 def knox
   super
   puts 'child'
 end
end

I hope this helps

Stefano

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