By Dave Thomas, David Heinemeier Hansson, Sam Ruby
Ruby on Rails is helping you produce fine quality, beautiful-looking net purposes quick. you consider developing the appliance, and Rails looks after the details.
Tens of hundreds of thousands of builders have used this award-winning ebook to profit Rails. It's a huge, far-reaching educational and reference that's instructed by way of the Rails center workforce. If you're new to Rails, you'll get step by step tips. If you're an skilled developer, this publication provide you with the excellent, insider details you need.
Rails has advanced through the years, and this publication has advanced in addition to it. We nonetheless commence with a step by step walkthrough of establishing a true program, and in-depth chapters examine the integrated Rails gains. This variation now offers new Ruby and Rails clients additional info at the Ruby language and takes extra time to provide an explanation for key recommendations all through. top practices on the right way to practice Rails proceed to alter, and this variation retains up. Examples use cookie subsidized classes, HTTP authentication, and lively Record-based kinds, and the e-book focuses all through at the correct approach to use Rails. also, this version now displays Ruby 1.9, a brand new liberate of Ruby with tremendous practical and function improvements.
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Extra info for Agile Web Development with Rails (4th edition)
Erb). 5. Rails processes this file through the ERb templating system, executing any embedded Ruby and substituting in values set up by the controller. 6. The result is returned to the browser, and Rails finishes processing this request. 0 printing, October 28, 2010) L INKING P AGES T OGETHER This isn’t the whole story—Rails gives you lots of opportunities to override this basic workflow (and we’ll be taking advantage of them shortly). As it stands, our story illustrates convention over configuration, one of the fundamental parts of the philosophy of Rails.
Cleaning Up Maybe you’ve been following along and writing the code in this chapter. If so, chances are that the application is still running on your computer. When we start coding our next application in ten pages or so, we’ll get a conflict the first time we run it, because it will also try to use the computer’s port 3000 to talk with the browser. Now would be a good time to stop the current application by pressing Ctrl-C in the window you used to start it. Now lets move on to an overview of Rails itself.
4 Choosing a Rails Version The previous instructions helped you install the latest version of Rails. But occasionally you might not want to run with the latest version. 0 printing, October 28, 2010) 30 S ETTING U P Y OUR D EVELOPMENT E NVIRONMENT you might want to run the version of Rails that matches this version used to develop this book so that you can be absolutely confident that the output and examples exactly match. Or perhaps you are developing on one machine but intending to deploy on another machine that contains a version of Rails that you don’t have any control over.