From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2010-08-06T18:15:43+09:00
Subject: Re: lt operator on class object, checking a class' superclasses

On Fri, Aug 6, 2010 at 10:57 AM, Tomasz Wrobel <tomekwr@gmail.com> wrote:
> Hi!
>
> Do you know a good way to check whether a class is a subclass of a
> certain class (given the class object, not an instance)?
>
> one way would be to check all of klass.superclass,
> klass.superclass.superclass till nil
>
> or klass.new.is_a?( cklass )

Klass.ancestors.include?(Ancestor)

For example:

irb(main):003:0> String.ancestors.include? Object
=> true

Jesus.