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Product Description
Product Description
Rails Core developer Jose Valim guides you through seven different tutorials, each of them using test-driven development to build a new Rails extension or application that solves common problems with these new APIs. You will understand how the Rails rendering stack works and customize it to read templates from the database while you learn how to mimic Active Record behavior, like validations, in any other object. You will find out how to write faster, leaner controllers, and you'll learn how to mix Sinatra applications into your Rails apps, so you can choose the most appropriate tool for the job. In addition, you will improve your productivity by customizing generators and responders.
This book will help you understand Rails 3's inner workings, including generators, template handlers, internationalization, routing, and responders. With the knowledge you'll gain, you'll be ready to tackle complicated projects more easily than ever before, creating solutions that are well-tested, modular, and easy to maintain.
About the Author
Jose Valim is the lead developer and co-founder of Plataforma Tec. He started working with Ruby and Rails in late 2006 and was invited to be part of the Rails Core Team in 2010 after his work on Rails 3 development. He's also author and maintainer of various other well-known open source projects that led him to receive a Ruby Hero award in recognition for his contributions to the community. Lately, he's been flying around the globe giving talks and courses about Ruby and Rails.
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Customer Reviews
The Good
The book flows pretty well. Each chapter contains a challenge or set of related challenges and it's pretty easy to follow along with the code. Each example contains automated tests, and he creates a gem for almost each solution, so that it is easy to see how to modularize things.
The coverage of Rails internals is really enlightening. Sometimes it can be a bit dry, but you'll learn quite a few things about Renderers, Responders, Engines, Railties, Routing, Rack, Instruments, and more.
The book also contains a wide range of technology topics. José doesn't just utilize Rails & ActiveRecord. Other examples include MongoMapper, Redis, and Sinatra.
The Bad
Even though each of the examples contains unit tests, they are written in a style that I find to be problematic in real systems. The concise nature of the tests is probably an artifact of being printed, but most of the testing examples utilize few test classes with many assertions per test method.
In addition, though he "writes" the tests before implementation, this actually hurts understandability in some cases. The reason is most of the tests read as if he already knew the implementation and knew exactly how to test it. But it isn't apparent to the reader.
I tend to prefer RSpec with 1 assertion per test method and many fine-grained methods that test various behaviors in each context my system is in. The book's Test::Unit style wasn't something I'd suggest as a good way to test real applications.
The Bottom Line
Ultimately I think the book is excellent, and certainly gives plenty of information about Rails 3 internals. I think newcomers would probably be lost, but if you're past the newbie stage with Rails then this book is recommended.
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