From: lasitha <lasitha.ranatunga@...>
Date: 2009-03-29T13:54:23+09:00
Subject: Re: Dynamic object creation in ruby

On Sun, Mar 29, 2009 at 9:00 AM, Clash Fasn <bangclash@yahoo.com> wrote:
> I'm trying to do dynamic object creation in ruby.
>
> This works:
>
> john = eval("Master::Person").new("John")
>
> This fails:
>
> frank = Object.const_get("Master::Person").new("Frank")
>
> Does anyone know why the second way fails?
> --
> Posted via http://www.ruby-forum.com/.

This will work:
Object.const_get("Master")::Person.new("Frank")

Or:
Object.const_get("Master").const_get("Person").new("Frank")

Or:
"Master::Person".split('::').reduce(Object){|cls, c| cls.const_get(c) }

But your question was 'why?'... I guess the short answer is #const_get
just doesn't interpret the scope operator, '::'.  Actually, thinking
of it as an operator (hence it works in eval) and not a naming
convention is perhaps helpful.

cheers,
lasitha