Just a few notes on a recent upgrade with a rails project that was fairly young thus did not have a lot of issues moving to rails 3.

• script/plugin install git://github.com/rails/rails_upgrade.git
• rails:upgrade:backup
• rake rails:upgrade:routes >> config/routes.rb
  • edit file removing everything before the  “Application.routes.draw” line
• rake rails:upgrade:gems > Gemfile
  • edit Gemfile to remove top line
• rake rails:upgrade:configuration > config/application.rb
  • edit application.rb and remove top line
• rails new .
  • since this was a relatively young application I was able to overwrite everything but:
    • Gemfile
    • application_controller.rb
    • application_helper.rb
    • app/views/layouts/application.html.erb
    • config/routes.rb
    • config/locales/en.yml
    • config/database.yml
    • db/seeds.rb
    • public/javascripts/application.js