By Sam Ruby, Dave Thomas, David Heinemeier Hansson

Ruby on Rails is helping you produce top quality, beautiful-looking net purposes quick. you consider developing the appliance, and Rails looks after the main points. Tens of hundreds of thousands of builders have used this award-winning ebook to benefit Rails. it is a large, far-reaching educational and reference that is steered through the Rails center staff. in case you are new to Rails, you will get step by step counsel. in case you are an skilled developer, this publication provides you with the excellent, insider info you would like. Rails has advanced through the years, and this booklet has developed in addition to it. We nonetheless begin with a step by step walkthrough of creating a true software, and in-depth chapters examine the integrated Rails good points. This variation now offers new Ruby and Rails clients additional information at the Ruby language and takes extra time to provide an explanation for key recommendations all through. most sensible practices on find out how to follow Rails proceed to alter, and this version retains up. Examples use cookie sponsored classes, HTTP authentication, and lively Record-based kinds, and the ebook focuses all through at the correct method to use Rails. also, this variation now displays Ruby 1.9, a brand new unlock of Ruby with monstrous practical and function advancements.

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Extra info for Agile Web Development with Rails (4th edition) Beta 12 version

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It’s a simple way to ensure that accidental breakages get immediate attention. You can also set up your CI system so that your customers can use it to play with the bleeding-edge version of your application. This kind of transparency is a great way of ensuring that your project isn’t going off the tracks. 0 printing, January 10, 2011) 33 S ETTING U P Y OUR D EVELOPMENT E NVIRONMENT Editors We write our Rails programs using a programmer’s editor. We’ve found over the years that different editors work best with different languages and environments.

The create method handles user requests. In this case, it finds the current user’s shopping cart (which is an object managed by the model). It also asks the model to find the information for product 2. It then tells the shopping cart to add that product to itself. (See how the model is being used to keep track of all the business data? ) Now that the cart includes the new product, we can show it to the user. The controller invokes the view code, but before it does, it arranges things so that the view has access to the cart object from the model.

More typically you’ll want to include dynamic content created by the action method in the controller. 0 printing, January 10, 2011) 56 A CTION P ACK : T HE V IEW AND C ONTROLLER In Rails, dynamic content is generated by templates, which come in three flavors. The most common templating scheme, called Embedded Ruby (ERb), embeds snippets of Ruby code within a view document, in many ways similar to the way it is done in other web frameworks, such as PHP or JSP. While this approach is very flexible, some are concerned that it violates the spirit of MVC.

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