From: James Coglan <jcoglan@...>
Date: 2008-08-27T20:44:46+09:00
Subject: Re: Difficult Inheritance Problem

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>
> The easiest way I can think of is:
>
>  class Page
>    class << self
>      attr_accessor :difference_mapping
>    end
>    def self.inherited(c)
>      c.difference_mapping = difference_mapping
>    end
>  end
>
>  Page.difference_mapping =  { :blah => :blah }
>
>  class Next < Page
>  end
>
>  p Next.difference_mapping   # { :blah => :blah }



Depends whether you only need the definition done once. This technique will
not cause the subclass to reflect the parent class' value if it is changed,
e.g.:

Page.difference_mapping = {:foo => :something}
Next.difference_mapping #=> {:blah => :blah}

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