[RVM] How to Manage Ruby on Rails Versions

Here’s how to manage Ruby on Rails versions with RVM, the Ruby version management system.

First, switch to the Ruby validation that will use Rails.

$ rvm use 1.9.3
Using /Users/your_user/.rvm/gems/ruby-1.9.3-p194

Display the list of gemsets.

$ rvm gemset list

gemsets for ruby-1.9.3-p194 (found in /Users/your_user/.rvm/gems/ruby-1.9.3-p194)
   global

Create a gemset so that gemset names don’t conflict.

By the way, I create a gemset for each Rails application.

$ rvm gemset create myapp

Switch to the created gemset.

$ rvm gemset use myapp

Finally, install Rails and you’re done.

$ gem install rails

That’s all from the Gemba.