Installing Ruby on Rails on a MAC

install_ruby_on_rails_macosx

(1) Install gcc for the MAC OSX. (https://github.com/kennethreitz/osx-gcc-installer), scroll down Option1, then download 10.8. 
(2) Install git for MAC: http://code.google.com/p/git-osx-installer. Go to downloads, then latest upload. 
(3) Install RVM, following this https://rvm.io/rvm/install/, enter the following commands on the terminal
  \curl -L https://get.rvm.io | bash -s stable
  source ~/.rvm/scripts/rvm
  
To see that RVM was installed run this command:
  type rvm | head -n 1

It should return:
  rvm is a function

(4) Install Ruby, run the following command:
  rvm install 1.9.2
  rvm use 1.9.2
  
Check that Ruby was installed:
  ruby -v

It should return the version 1.9.2

To use that version as default:
  rvm use 1.9.2 --default

(5) Install Rails
  gem install rails -v 3.2.11

Check it was installed, it should return the version number
  rails -v

(6) You can also install Textmate instead of Sublime 2. Easier, no need to setup anything. "Convention over configuration"

DONE
If this doesn't work or you have questions tweet me @tomordonez