From: david@...
Date: 2006-05-13T02:07:13+09:00
Subject: Re: Inheriting class-based state

@ means instance member variable
@@ means class member variable

Just change @my_name to @@my_name and you'll be good to go.

David Koontz

> This one puzzles me - I know there's something fundamental that I'm not
> understanding about Ruby's object model. Consider these classes:
>
> class Base
>  def self.my_name=(value)
>    @my_name = value
>  end
>  def self.my_name
>    @my_name
>  end
> end
>
> class Derived < Base; end
>
> Base.my_name = 'John'
> puts Base.my_name
> John
>
> Derived.my_name
> nil
> Derived.my_name = 'Mike'
> puts Derived.my_name
> Mike
>
> So the class instance member @my_name isn't inherited by the Derived class.
>
> How do I share state between a derived class and its base class?
>
> Thanks
> -John
> http://www.iunknown.com