Rails 4 Released: Faster Pages With Turbolinks
The Ruby on Rails team has just released Rails 4.0. One and a half years in the making, Rails 4 comes with some interesting new features like Turbolinks, improved caching and is thread-safe by default. Many of the changes are already used by 37 Signals' Basecamp Next.
Rails 4 also comes with support for key-based cache expiration, which automates cache invalidation and thus makes it easier to implement intricate caching structures.
The release also dropped support for Ruby 1.8 and recommends to upgrade to Ruby 2. Ruby 1.9 is still supported, but Rails 5 will require at least Ruby 2. As usual, there's a detailled upgrade guide for Rails 3.2 applications to Rails 4.
For a more detailed list of changes, see the changelog. Have you already upgraded your application to Rails 4? We'd love to hear about your experience!