Rails 4实战指南：2015最新版

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"Rails.4.in.Action.2015.8.pdf"是一本深入浅出的Ruby on Rails（Rails 4）技术指南，由Ryan Bigg、Yehuda Katz、Steve Klabnik和Rebecca Skinner等人合著。这本书是Rails 4版本的实战教程，专为现代Ruby开发者设计，旨在提供全面且实用的Rails技术和习惯，帮助读者理解和掌握最新的框架特性。该书的特点在于其对话式的写作风格和时效性，强调实际应用中的开发过程，通过开发一个应用程序来引导读者学习。书中不仅涵盖了基础Rails知识，还特别关注非基础gem（Ruby gem）的使用，这些扩展库在实现特定功能时发挥关键作用，使得读者能够在实际项目中快速上手。书中得到的积极评价表明，它对于Rails 3至4版本的过渡有着重要的指导意义，如Anthony J. Topper提到的Rails 3冒险之旅，以及Jason Rogers对内容深度和信息丰富的赞赏。它被赞誉为新手和经验丰富的Rails开发者的必备参考，帮助J.K. Wood解决了API设计难题，并使Leo Cassarani能够成功部署自己的应用。在前五章的学习中，读者可以收获大量的Rails基础知识，远远超过其他资源的综合效果，如Mario Alberto Chávez Cárdenas所述。作者们以自然和轻松的方式写作，让学习者在实际项目的构建过程中逐步提升技能。 "Rails 4 in Action"是一本实用性强、适合不同层次开发者阅读的书籍，不仅提供了理论知识，而且通过实例展示了如何在Rails 4环境中有效地开发和部署应用。对于希望深入理解并熟练掌握Rails 4技术的读者来说，这是一份不可或缺的宝贵资源。

preface

I came to be an author on this book back in April 2010, and then spent about a year

and a half writing it from scratch while working full-time. The first edition, Rails 3 in

Action, was published in September of 2011. It’s now 2015 and the revised edition is

finally here, this time focusing on Rails 4.2 instead of Rails 3.1.

During this time, many changes have come to pass in the Ruby and Rails commu-

nity, with almost 40 new versions of Rails since 3.1. The way we whitelist data attributes

received from the outside world has moved from the models to the controllers. The

popularity of Cucumber (a staple in the first edition) has faded, and it has been

replaced by

RSpec and Capybara. Validation syntax has morphed. The

find_by_*

finders have been deprecated. And so much more.

By the time this book goes to print, Rails 5 will be due for release. Rails changes much

faster than other frameworks, and with good reason—the community around it is

actively evolving the best ways to write web applications. Other frameworks (or even lan-

guages, cough Java), evolve much more slowly. My thoughts about publishing this book,

even though Rails 5 is coming soon, are these: It’s worthwhile to know Rails 4 and to have

a good grasp of how applications are built. This book is a good indication of where the

community is in terms of getting started with Rails at this particular point in time.

Days (here and there) and nights (mostly) have gone into updating this book. Not

one page has gone without review. It’s our utmost pleasure to bring you a book that is

up to date after such a long wait. Never did I think it would take this long between

publications, but that’s how things played out. “Good feels” is an apt expression to

explain what it’s like to finally have this book done.

Licensed to Mark Watson <nordickan@gmail.com>

ACKNOWLEDGMENTS

xviii

XML

, or Markdown. Dan Allen, for writing Asciidoctor, which we used to compile the

HTML and PDF versions of the book that we shared with our reviewers.

Thanks to everyone at Manning, from my development editor Susan Conant to

technical editor Steven Jenkins to technical proofreader Doug Warren to everyone on

the production team to the marketing folks—and to many more who worked behind

the scenes.

Also thanks to the following peer reviewers who read the manuscript at various

stages of its development: Alex Perucchini, Michele Bursi, Damien White, Eddie

Welker, Gavin Whyte, Greg Helton, Jared Hirsch, Justin Wiley, Lee Allen, Mike

Gehard, Nathan Bean, Paul Hollyer, Robert O’Connor, Steve Robertson, William E.

Wheeler, and William Ko. Your comments and insights made this a better book!

Finally, I thank my wife, Sharon, for putting up with all the time that I’ve spent on

this book, obsessing about this book, and so on. Thanks for being as wonderful as you

are, my love.

YAN BIGG

I can say with confidence that this book, much like Rails 3 in Action, would not exist

without the hard, tireless work of Ryan Bigg. It was Ryan’s idea to focus both books

around real-world testing from the ground up, and it makes them the best books for

Rails practitioners that teach Rails the way professional Rails developers do it.

Ever since Merb was merged with Rails, I have had the benefit of not insignificant

support from friends and family, who helped keep me on course in the long process

that eventually delivered Rails 3.0, and then went beyond. I want to especially call out

Aaron Patterson, José Valim, Santiago Pastorino, and Xavier Noria, who stepped up

and brought life back to a community that was starting to show signs of age. And Carl

Lerche, who helped me keep focus on doing things right, even when it was tempting

not to.

Finally, I would be remiss if I didn’t thank my wife, Leah, who has been there for

me through the amazing trajectory of my development career, through good times

and bad. Without her, I would have given up long ago.

EHUDA KATZ

I should know better than to give estimates.

When I first started to work on this book, I thought updating it would take me

three months. Oh, how foolish I was! In the end, I worked hard for about eighteen, I

think. I don’t want to look back at that calendar!

After this book chewed me up and spit me out, Ryan and Rebecca came on and

took it over the finish line. I’m deeply indebted to them for helping pull me out of the

quicksand.

Licensed to Mark Watson <nordickan@gmail.com>

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