2.3 -> 3 saw the Rails and Merb projects merge, and a ton of changes to remove some of the most unmaintainable magical elements of Rails. https://medium.com/rub

2.3 -> 3 saw the Rails and Merb projects merge, and a ton of changes to remove some of the most unmaintainable magical elements of Rails. https://medium.com/ruby-on-rails/upgrading-a-rails-2-app-to-rails-3-d25c7b390fa1 https://medium.com/ruby-on-rails/upgrading-a-rails-2-app-to-...