From: "ara.t.howard" <ara.t.howard@...>
Date: 2007-11-22T09:20:43+09:00
Subject: Re: Dynamically call classes


On Nov 21, 2007, at 4:02 PM, jacob.dunphy@gmail.com wrote:

> And with this, you can do the var = Kernel.const_get("ClassName") and
> you have a reference to that class for the scope of your operation.

imho const_get is just to fragile for most uses, i prefer something  
like this:



cfp:~ > cat a.rb
class Class
   def self.for string
     value =
       Thread.new do
         $SAFE = 4
         eval string.to_s, TOPLEVEL_BINDING.dup
       end.value
     raise ArgumentError unless value.is_a? Class
     value
   end
end

p Class.for('File::Stat')
p Class.for('Foo::Bar')



cfp:~ > ruby a.rb
File::Stat
a.rb:6:in `eval': (eval):1: uninitialized constant Foo (NameError)
         from a.rb:4:in `value'
         from a.rb:4:in `for'
         from a.rb:14



a @ http://codeforpeople.com/
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