From: Rob Biedenharn <Rob@...>
Date: 2008-02-05T06:12:44+09:00
Subject: Re: String to Class

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On Feb 4, 2008, at 2:30 PM, Wolfgang N=E1dasi-Donner wrote:

> Roberto Eduardo Decurnex Gorosito wrote:
>> Is it possible to convert a String into a Class id?
>>
>> Something  like  'Array'.to_class.new
>
> Object.const_get("Array").new
>
> Wolfgang N=E1dasi-Donner

Or more generally,
   # from Jim Weirich (based on email correspondence)
   def constantize(camel_cased_word)
     camel_cased_word.
       sub(/^::/,'').
       split("::").
       inject(Object) { |scope, name| scope.const_get(name) }
   end

Also, you can see how ActiveSupport does it for Rails:

# File vendor/rails/activesupport/lib/active_support/inflector.rb, =20
line 245
245: def constantize(camel_cased_word)
246:   unless /\A(?:::)?([A-Z]\w*(?:::[A-Z]\w*)*)\z/ =3D~ =
camel_cased_word
247:     raise NameError, "#{camel_cased_word.inspect} is not a valid =20=

constant name!"
248:   end
249:
250:   Object.module_eval("::#{$1}", __FILE__, __LINE__)
251: end

-Rob

Rob Biedenharn		http://agileconsultingllc.com
Rob@AgileConsultingLLC.com


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