From: ThoML <micathom@...>
Date: 2008-02-19T01:24:56+09:00
Subject: Re: how to find parent object_id into child object ?

Well, I'm not sure if I understood the question right. But I think
something like this is possible (struct maybe is a bad choice for
demonstration purposes):

class A
    def initialize(o=nil)
        @o = o
    end
end

Anyway, the proper way probably would be to design the class so that
obj2 gets a reference to obj1 when it is included in obj1 (if you know
it needs such a reference), which is what Robert meant I suppose.