Sinatra’s Hat, the library that lets you create a RESTful Sinatra app in 1 line of code has been completely rewritten, wit a new and improved API. Example mount Article. And that’s it. It works with ActiveRecord out of the box, but can support any ORM. It also supports nested resources, the ability to specify actions to be protected via basic auth, custom formatters, and a sweet DSL for specifying custom flow control.