Cookie-based authentication with Rails

I'm launching a new free book called Cookie-based Authentication with Ruby on Rails! As you may know, Rails 8 is going to be released soon and will come with an authentication generator. I think it's a great addition to the framework: Authentication gems such as Devise work well out of the box but can be quite hard to customize. However, this generator won't work like a gem. Instead, it will copy/paste the authentication code into your Rails application. If you want to use it, you need to understand how authentication works in depth. This new book is here to show you that understanding authentication is not that hard. You will also learn a few tricks that you can reuse in other situations. I hope you enjoy reading this new book! Until next time.