From: pjb@... (Pascal J. Bourguignon)
Date: 2009-01-24T10:43:09+09:00
Subject: Re: instantiate a class dynamically

"rpardee@gmail.com" <rpardee@gmail.com> writes:

> Hey All,
>
> If I have the name of a class in a string var, is it possible to get a
> new instance of that class (and if so, how)?  The following do *not*
> work:
>
>   my_string = "Hash"
>
>   my_object = Class(my_string)
>   my_object = Class.new(my_string)
>   my_object = Object.new(my_string)

Class names are used to define constants in the Module module:


irb(main):014:0> className="Hash"
"Hash"
irb(main):015:0> Module.constants.member?(className)
true

Therefore you should be able to get the class with:

irb(main):016:0> Module.class_eval(className)
Hash

and make an instance with:

irb(main):017:0> Module.class_eval(className).new
{}

-- 
__Pascal Bourguignon__