Alan Harris - Sinatra: Up and Running
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Copyright 2011 Alan Harris
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Nutshell Handbook, the Nutshell Handbook logo, and the OReilly logo are registered trademarks of OReilly Media, Inc. Sinatra: Up and Running , the image of a whip-poor-will, and related trade dress are trademarks of OReilly Media, Inc.
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While every precaution has been taken in the preparation of this book, the publisher and authors assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein.
When people speak of Ruby web development, it has historically been in reference to the opinionated juggernaut that is Rails. This is certainly not an unfounded association; Hulu, Yellow Pages, Twitter, and countless others have relied on Rails to power their (often massive) web presences, and Rails facilitates that process with zeal.
Why, then, are people so interested in Sinatra, the tiny little domain-specific language that could?
Rails was a breath of fresh air to many developers exhausted by the old ways ; Sinatra enters the arena with a similar game-changer: a beautifully minimalistic, Ill get out of your way approach. No generators, no complex folder hierarchies, and a brief yet expressive syntax that maps closely to the functionality exposed by the Hypertext Transfer Protocol verbs.
In short, Sinatra is for classy web development.
Our goal is to provide the core concepts and accompanying examples to help you feel comfortable using Sinatra as quickly as possible. By the end, you should have a working knowledge of Sinatra and how it fits into the larger Ruby web development ecosystem. You should know when Sinatra will get the job done quickly and when it might be better to lean on Rails, Padrino, or similar frameworks. You should also have a better sense of the internals of Sinatra, as well as the Rack specification and accompanying gem.
No worries, we wont short-change you on the reference aspects; you can certainly return to this book to recall how to perform daily tasks without excessive searching.
With that said, lets get you up and running.
Sinatra: Up and Running is for developers with some Ruby experience under their belt, and ideally some web development experience as well. Some concepts that are core to web development (the HTTP specification, HTML, CSS, etc.) are critical to understanding how to be productive with Sinatra; we recommend that you have at least a passing familiarity with these concepts to make the experience a little easier.
If youve written some web applications before but not specifically in Ruby, thats no problem. Our discussion of other tools is primarily limited to comparing and contrasting with how Sinatra does things.
Our plan is to try to address the needs of several distinct camps of readers: those with a Ruby web development background in Rails but no experience with Sinatra, as well those who are familiar with Sinatra but would like a tour of its internals and philosophy. Where possible, wed also like to help bring developers without direct web experience into the fold. Pretty tricky if you think about it, but well do our best to speak to all the seats in the house by the conclusion.
Given these stated goals, weve divided the materials into three sections. The beginning of the book focuses on the bare minimum you need to know to work with Sinatra. Here youll find the fundamentals, such as how to craft routes, manage sessions, create views, and so on. Immediately afterward, we will lift the veil and examine some of the techniques behind the scenes, which will open up a world of possibilities for implementation and integration. Finally, we will wrap up the discussion with some practical applications, including developing a GitHub-powered blog.
Weve also tried to inject as much related information as possible for the various topics covered within, ranging from gotchas to other resources where one could explore subtopics in greater depth.
One aside: if you encounter a section explaining information youre already well-versed in, please bear with us as other readers may benefit from the discussion. We strive to keep the pace brisk, but wed prefer not to leave any folks out.
Sinatra: Up and Running is organized as follows.
, Taking the Stage , serves as a high-level introduction to some of the core concepts in Sinatra. It also discusses how to install the Sinatra gem, and walks through the creation of a simple application.
, Fundamentals , covers the different features of Sinatra, such as route definitions, creating views, managing sessions, and so on. It also serves as something of a reference chapter, with each topic discussed in granular fashion.
If youve already built some Sinatra applications of your own and are fairly comfortable doing so, you can likely just skim through Chapters 1 and 2, although the newest release of Sinatra (version 1.3.1) contains a number of changes that are worth exploring (including support for the HTTP PATCH verb, streaming, etc.).
In , A Peek Behind the Curtain , we discuss the internals of Sinatra and its implementation; this includes coverage of Rack, building middleware, and other topics that clarify what really happens under the hood.
, Modular Applications , covers the various approaches available for subclassing Sinatra, allowing you to create significantly more flexible and robust architectures.
If youve built some Sinatra applications but have never really explored the source code (or written Rack applications directly), this section will help to flesh out your knowledge. Understanding the modular application approach is critical to taking full advantage of what Sinatra offers.
In , Your Own Blog Engine , we put the theory into application and create a Markdown-powered blog that takes advantage of the service hooks provided by the GitHub API.
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