From: ara.t.howard@...
Date: 2006-04-04T00:58:40+09:00
Subject: Re: Setting class variable from parent class?

On Tue, 4 Apr 2006, Marco wrote:

> Hi All!
>
> I'm trying to teach my Parent class how to set variables into its Child
> class; ie
>
> class Parent
>  def self.set_my_class_variable(value)
>    reference_to_my_class.my_variable = value
>  end
> end
>
> class Child
>  set_my_class_variable "hello world"
> end
>
> I think what I'm missing is the way to reference the Child class. I've
> been wrongly supposing that
>
>  Parent.set_my_class_variable(value)
>    @@my_variable = value
>  end
>
> would be doing the work. But the '@@' syntax sets the class variable to
> Parent.
>
> Thank you,
> Marco


     harp:~ > cat a.rb
     class Parent
       class << self
         attr_accessor 'a'
         def inherited child
           child.a = 42
         end
       end
     end

     class Child < Parent
     end

     p Child.a


     harp:~ > ruby a.rb
     42


hth.

-a
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