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Upgrading to Rails 4
With the release of Rails 4.0.0.rc1 it's time to try it out and report any bugs. Here I walk you through the steps to upgrade a Rails 3.2 application to Rails 4.
(12 minutes)
Cache Digests
The cache_digests gem (also included in Rails 4) will automatically add a digest to the fragment cache key based on the template. If a template changes the cache will auto-expire. But watch out for the gotchas!
(7 minutes)
Strong Parameters
The strong_parameters gem is an improvement over attr_accessible to securely handle mass assignment even when you have complex authorization logic. The functionality will likely be added to Rails 4 so it is a good idea to learn how it works.
(12 minutes)
ActionController::Live
Server-sent events allow you to trigger events on the browser from a persistent connection to the server. This requires Rails stream data which can be done through ActionController::Live, a feature upcoming in Rails 4.
(14 minutes)
What's New in Rails 4
Rails 4.0 is still unfinished, but it is shaping up to become a great release. Here I show how to setup a new Rails 4.0 (edge) application and walk through many of its new features.
(20 minutes)
Turbolinks
Turbolinks can make your Rails app feel faster by using JavaScript to replace the page content when clicking a link. It will be default in new Rails 4.0 applications, but here I show how to use it in Rails 3 and mention some of the gotchas.
(7 minutes)