In this 4-part series of tutorials, I’m going to take you through the process of creating a fully functioning To Do List app called ‘Just Do It’, using Sinatra and DataMapper. Hopefully, this will help to demonstrate just how quick and easy it easy to use Sinatra. Let’s begin with the basics of Sinatra. Installing Sinatra To get started with Sinatra, you’ll need to have Ruby installed.
RubySource: Just Do It: Learn Sinatra, Part One