From: Brian Candler <lists@...>
Date: 2012-08-09T02:41:32+09:00
Subject: Re: Initializer with self

Iwan B. wrote in post #1071643:
> class B2
>   def initialize
>     a = A.new
>     self = a.foo # <<< error!
>   end
> ...
> end

It *is* possible to override the 'new' method:

class B2
  def self.new
    return A.new
  end
end

But this is very likely to confuse people who call B2.new and expect to 
get an instance of B2.

If you want to choose the class dynamically then the normal approach is 
a factory method:

class B2
  def self.create(*args)
    klass = pick_a_class   # choose your own logic here
    klass.new(*args)
  end
end

But it seems to me that subclassing is closest to what you're trying to 
achieve (making something which is like a workbook, but slightly 
modified)

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