Great post on the process:
http://blog.barbershoplabs.com/post/44196567484/upgrading-from-rails-3-2-to-rails-4-0
See also the RailsCast:
Great post on the process:
http://blog.barbershoplabs.com/post/44196567484/upgrading-from-rails-3-2-to-rails-4-0
See also the RailsCast: