Ruby Tutorial October 20, 2011 http://ruby.railstutorial.org/ruby-on-rails-tutorial-book#top http://oldwiki.rubyonrails.org/rails/pages/HowtoUseSQLite http://guides.rubyonrails.org/migrations.html Migráció: http://api.rubyonrails.org/classes/ActiveRecord/Migration.html Free Video: Installing Ruby 19 January 2012