This book is centered around snippet code so if you are looking for a cookbook start to finish project book this is not for you. The good side of this story is I have it loaded on my work computer. When I have syntax issues I simply perform a find on the subject. this has proven to be a very productive when working. Between stackoverflow the open community web source, and this book when coding I solve problems quickly. I am a professional Ruby / Ruby on Rails developer. For all those who just know Ruby on Rails you should really learn Ruby. What happens if one of your gems does not work? or gets monkey patched? or just doesn't work? You will be forced to dig deeper and you will need to know Ruby to sort out the R-on-R MVC framework guts.
Trust me I tried just learning Rails years ago, now I know Ruby I am very seldom defeated. If you like this comment get the book GREAT resource.