From: "Bradley, Todd" <todd.bradley@...>
Date: 2004-12-04T03:44:52+09:00
Subject: how to create an object of a class you don't know yet

Hi, I'm just now getting into Ruby's OO-ness, and could use some advice.
I'm trying to create an object, but which specific class needs to be
determined at runtime.  I figured out how to do this by creating a
string and executing it using the "eval" command, but I know there must
be an easier way.  My first guess was to do something like #{answer}.new
but that didn't work.


Here's my code:


class Foo
	def method1
	end
end

class Bar
	def method2
	end
end

# Pretend this was determined at runtime
answer = "Foo"


# There must be a better way of doing this:

myobj = Object.new # Needs to exist in this scope
mystring = "myobj = #{answer}.new"

eval mystring

puts "I just created a #{myobj.class} object."




Any advice is appreciated.  Thanks in advance!


Todd.