From: RichardOnRails <RichardDummyMailbox58407@...>
Date: 2008-09-13T12:13:11+09:00
Subject: Finding parent-class hierarchy recursively

Hi,

I wrote a method to display a class' "parentage" based on an idea in
"Ruby Cookbook", sec. 10.1:

def parents(obj)
  ( (obj.superclass ? parents(obj.superclass) : []) << obj). reverse
end

I displayed Class' parent-class hierarchy with:

Class.superclass.inspect  =>  Module
Module.superclass.inspect  =>  Object
Object.superclass.inspect  =>  nil

Then I tested the automatic generation of that hierarchy as follows:

parents(Class).inspect  =>  [Class, Object, Module]
			Expected:  [Class, Module, Object]

I tried display intermediate values during the recursion,  but I
couldn't see where I'm going wrong.  Any ideas?

Thanks in advance,
Richard