Agile Web Development with Rails 4 (Facets of Ruby) by Dave Thomas, David Heinemeier Hansson, Sam Ruby

By Dave Thomas, David Heinemeier Hansson, Sam Ruby

Rails simply retains on altering. either Rails three and four, in addition to Ruby 1.9 and 2.0, carry thousands of advancements, together with new APIs and mammoth functionality improvements. The fourth version of this award-winning vintage has been reorganized and refocused so it's extra priceless than ever sooner than for builders new to Ruby and Rails.

Rails four introduces a few user-facing alterations, and the book has been up-to-date to compare the entire most modern alterations and new top practices in Rails. This contains complete aid for Ruby 2.0, controller matters, Russian Doll caching, robust parameters, Turbolinks, new try out and bin listing layouts, and lots more and plenty more.

Ruby on Rails is helping you produce top quality, beautiful-looking net functions fast. you think about developing the appliance, and Rails looks after the details.

Tens of hundreds of thousands of builders have used this award-winning e-book to profit Rails. It's a vast, far-reaching educational and reference that's instructed via the Rails center crew. If you're new to Rails, you'll get step by step suggestions. If you're an skilled developer, this ebook offers you the great, insider info you need.

Rails has developed through the years, and this publication has developed besides it. We nonetheless begin with a step by step walkthrough of creating a true program, 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 give an explanation for key recommendations all through. top practices on easy methods to follow Rails proceed to alter, and this variation retains up. Examples use matters, Russian Doll caching, and Turbolinks, and the booklet focuses all through at the correct solution to use Rails. also, this version now works on Ruby 2.0, a brand new liberate of Ruby with mammoth useful and function improvements.

This variation is for Rails4.0 and beyond.

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For example, in the following code, the block containing puts "Hi" is associated with the call to the method greet(). greet { puts "Hi" } If a method call has parameters, they appear before the block. verbose_greet("Dave", "loyal customer") { puts "Hi" } A method can invoke an associated block one or more times using the Ruby yield statement. You can think of yield as being something like a method call that calls out to the block associated with the method containing the yield. You can pass values to the block by giving parameters to yield.

As we’ve been adding code to our application, we haven’t had to restart the running application. It has been happily chugging away in the background. And yet each change we make is available whenever we access the application through a browser. What gives? It turns out that the Rails dispatcher is pretty clever. In development mode (as opposed to testing or production), it automatically reloads application source files when a new request comes along. That way, when we edit our application, the dispatcher makes sure it’s running the most recent changes.

Let’s start by creating a simple application that sends our cheery greeting to a browser. After we get that working, we will embellish it with the current time and links. As we’ll explore further in Chapter 3, The Architecture of Rails Applications, on page 29, Rails is a Model-View-Controller framework. Rails accepts incoming requests from a browser, decodes the request to find a controller, report erratum • discuss Chapter 2. Instant Gratification • 18 Figure 1—Newly created Rails application and calls an action method in that controller.

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