I recently upgraded a 3.2 application to 4.0. At a high level, the necessary refactoring to make 4.0 work wasn't bad. It was upgrading gem dependencies, and som

I recently upgraded a 3.2 application to 4.0. At a high level, the necessary refactoring to make 4.0 work wasn't bad. It was upgrading gem dependencies, and sometimes switching out deprecated gems, that was a much bigger pain.