I guess the idea is that you don't need to only use what Rails provides you, and you're free to bake in your own Ruby as you see fit. Rails is just Ruby, after

I guess the idea is that you don't need to only use what Rails provides you, and you're free to bake in your own Ruby as you see fit. Rails is just Ruby, after all, and its modular enough at its core to be extensible for all sorts of applications. You just might have to do some digging to get your Ruby code Rails-friendly, such as using POROs alongside a form builder requires you to include ActiveModel::Naming