This short early adopter book details both how you'll upgrade existing web applications from Rails 4.2 to 5 and how to create new applications in Rails 5. The headline features, Rails API and Action Cable are each looked at in detail, building small example projects to demonstrate how to build a JSON API and add real-time interactions in order to create a single-page application.
All the breaking changes are shown, along with how to fix your app to work with the new release. The improvements to ActiveRecord and the testing framework are fully detailed. After reading and using Rails 5...