I'm trying to upgrade to rails 4 beta 1, but I've a bit of a problem.
This is, in short, how my application controller looks like.
class ApplicationController < ApplicationController
gem "actionpack-action_caching", github: "rails/actionpack-action_caching"
app/controllers/application_controller.rb:3:in `<class:ApplicationController>': undefined method `caches_action' for ApplicationController:Class (NoMethodError)
As the caching is not a part of core anymore, you need to explicitly require it in top of every file you use it in: