Download Agile Web Development with Rails (4th edition) Beta 13 by Sam Ruby, Dave Thomas, David Heinemeier Hansson PDF

By Sam Ruby, Dave Thomas, David Heinemeier Hansson

Ruby on Rails is helping you produce top quality, beautiful-looking internet purposes quick. you consider developing the appliance, and Rails looks after the main points. Tens of millions of builders have used this award-winning ebook to benefit Rails. it is a extensive, far-reaching educational and reference that is instructed by means of the Rails middle group. if you are new to Rails, you will get step by step suggestions. in case you are an skilled developer, this ebook provides you with the excellent, insider details you would like. Rails has advanced through the years, and this ebook has developed in addition to it. We nonetheless commence with a step by step walkthrough of creating a true software, and in-depth chapters examine the integrated Rails gains. This version now supplies new Ruby and Rails clients additional information at the Ruby language and takes extra time to give an explanation for key suggestions all through. most sensible practices on the best way to follow Rails proceed to alter, and this version retains up. Examples use cookie sponsored periods, HTTP authentication, and lively Record-based varieties, and the e-book focuses all through at the correct solution to use Rails. also, this variation now displays Ruby 1.9, a brand new unencumber of Ruby with vast useful and function advancements.

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If you come from a language such as Java, you might be surprised that Ruby doesn’t insist on parentheses around method parameters. You can always add them if you like. 0 printing, February 2, 2011) 48 W HAT W E J UST D ID The say_goodbye_path is a precomputed value that Rails makes available to application views. It evaluates to the /say/goodbye path. Over time you will see that Rails provides the ability to name all the routes that you will be using in your application. OK, back to the application.

16 or thereabouts). If you want to follow along with our code, it’s probably simplest if you use SQLite 3 too. If you decide to use something else, it won’t be a major problem. You may have to make minor adjustments to any explicit SQL in our code, but Rails pretty much eliminates database-specific SQL from applications. If you want to connect to a database other than SQLite 3, Rails also works with DB2, MySQL, Oracle, Postgres, Firebird, and SQL Server. For all but SQLite 3, you’ll need to install a database driver, a library that Rails can use to connect to and use your database engine.

In Ruby, you’d define a class to represent each of these categories. You then use this class as a kind of factory that generates objects—instances of that class. An object is a combination of state (for example, the quantity and the product id) and methods that use that state (perhaps a method to calculate the line item’s total cost). We’ll show how to create classes on page 66. 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.

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