[O] org-babel ruby 1.8 and 1.9

[Steve Harman]

Hello, 

On my mac, I have rvm installed with ruby 1.9.2 being default.
On the terminal, if I execute ruby, it is always 1.9.2 version.
However, the ruby ran by org-babel is 1.8 version. 
How can I make the ruby code blocks in my org files 
executed by 1.9? 

Since I am new to Emacs, I would appreciate your help.
I found org-mode and org-babel extremely helpful in preparing 
course notes. That's why, in fact, I switched to Emacs.
In an attempt to solve the above problem, I installed rvm.el
and put it in my init.el right before loading the org-babel languages.

(add-to-list 'load-path "/Users/stvharman/.emacs.d/lisp/rvm")
(require 'rvm)
(rvm-use-default) ;; use rvm’s default ruby for the current Emacs session

(org-babel-do-load-languages
 'org-babel-load-languages
 '(
   (R . t)
   (ruby . t)
    ))

Thank you in advance.

Have a nice weekend (and week ahead),

Steve