By Sam Ruby, Dave Thomas, David Heinemeier Hansson

Ruby on Rails is helping you produce top of the range, beautiful-looking internet purposes speedy. you consider developing the appliance, and Rails looks after the main points. Tens of millions of builders have used this award-winning e-book to benefit Rails. it is a vast, far-reaching educational and reference that is instructed through the Rails middle staff. in case you are new to Rails, you will get step by step information. in case you are an skilled developer, this booklet offers you the great, insider details you wish. Rails has developed through the years, and this booklet has advanced besides it. We nonetheless begin with a step by step walkthrough of creating a true software, and in-depth chapters examine the integrated Rails beneficial properties. This version now provides new Ruby and Rails clients additional information at the Ruby language and takes extra time to give an explanation for key techniques all through. most sensible practices on tips on how to follow Rails proceed to alter, and this version retains up. Examples use cookie sponsored classes, HTTP authentication, and lively Record-based varieties, and the ebook 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 titanic useful and function advancements.

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We’ll show how to create classes on page 65. Prepared exclusively for Anton Fonarev R UBY I S AN O BJECT -O RIENTED L ANGUAGE Objects are created by calling a constructor, a special method associated with a class. The standard constructor is called new. sku = "AUTO_B_00" Methods are invoked by sending a message to an object. The message contains the method’s name, along with any parameters the method may need. When an object receives a message, it looks into its own class for a corresponding method.

Class methods are used to perform table-level operations, and instance methods perform operations on the individual rows. In a typical ORM library, you supply configuration data to specify the mappings between entities in the database and entities in the program. Programmers using these ORM tools often find themselves creating and maintaining a boatload of XML configuration files. Active Record Active Record is the ORM layer supplied with Rails. It closely follows the standard ORM model: tables map to classes, rows to objects, and columns to object attributes.

Navigate to the URL http://localhost:3000/say/hello in a browser window. 2. Our First Action At this point, we can see that not only have we connected the URL to our controller, but also that Rails is pointing the way to our next step, namely to tell Rails what to display. That’s where views come in. Remember when we ran the script to create the new controller? That command added six files and a new directory to our application. That directory contains the template files for the controller’s views.

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