From: Alfredo Garcia lopez <fredini@...>
Date: 2008-10-22T22:18:56+09:00
Subject: Include code (conditionally) in a class and its subclasses

Hi.
Is there a way to include code in a class and all its subclasses and get
the behaviour as if it was included at the end of the code in each of
them?

Example:

class Product<ActiveRecord::Base
  def price
   100
  end
end


module ProductExtension
  def price
   120
  end
end

I would wish find a way to include this module to the
superclass(ActiveRecord::Base) and get the following result:

@product=Product.new
@product.price  =>120

or even

module ProductExtension
  def precio
   old_price+30
  end
    alias_method :old_price, :price
    alias_method :price, :old_price
end

@product=Product.new
@product.price  =>130

The module to include would be conditional.
Ex: If the current class is Product I would include ProductExtension.
    If the current class is Category I would include CategoryExtension.

Perhaps there卒s a better way to chieve this.Accept suggestions.
Thanks for reading.
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