From: David Alan Black <dblack@...>
Date: 2002-07-26T23:24:42+09:00
Subject: Re: dynamic object creation

Hi --

On Fri, 26 Jul 2002, Daniel Berger wrote:

> Hi all,
>
> I couldn't quite find the answer I was looking for on Google (though
> it's probably there somewhere), so I'll pose the question here.
>
> I have a situation where the class and module names are identical.  I
> want to dynamically generate an object based on a string.
>
> m = "TestClass"
> require "#{m}"
> t = eval "#{m}.new"
>
> This works, but I'm wondering if there's a more "graceful" approach.

#require just wants a string:

  irb(main):005:0> d = "parsedate"
  "parsedate"
  irb(main):006:0> require d
  true

To go from string to constant, you can use Module#const_get:

  irb(main):007:0> s = "String"
  "String"
  irb(main):008:0> str = type.const_get(s).new("hi")
  "hi"


David

-- 
David Alan Black
home: dblack@candle.superlink.net
work: blackdav@shu.edu
Web:  http://pirate.shu.edu/~blackdav