Rails 3 in a Nutshell, by Cody Fauser, James MacAulay, Edward Ocampo-Gooding, and John Guenin, O’Reilly, 2013
For experienced web programmers interested in expert-level Ruby on Rails material, written by some of the lead programmers of Shopify. Read it online at O’Reilly. Hopefully this book will be in the Ottawa Library in the future!