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

By Dave Thomas, David Heinemeier Hansson, Sam Ruby

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 details.

Tens of millions of builders have used this award-winning ebook to profit Rails. It's a vast, far-reaching educational and reference that's advised by way of the Rails center group. If you're new to Rails, you'll get step by step suggestions. If you're an skilled developer, this ebook offers you the excellent, insider info you need.

Rails has advanced through the years, and this publication has advanced in addition to it. We nonetheless begin with a step by step walkthrough of establishing a true software, and in-depth chapters examine the integrated Rails positive factors. This variation now supplies new Ruby and Rails clients additional info at the Ruby language and takes extra time to provide an explanation for key ideas all through. most sensible practices on easy methods to follow Rails proceed to alter, and this variation retains up. Examples use cookie sponsored classes, HTTP authentication, and lively Record-based kinds, and the booklet focuses all through at the correct approach to use Rails. also, this variation now displays Ruby 1.9, a brand new unlock of Ruby with massive sensible and function improvements.

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Extra resources for Agile Web Development with Rails (4th edition)

Sample text

1 to see how the three concepts fit together. The MVC architecture was originally intended for conventional GUI applications, where developers found the separation of concerns led to far less coupling, which in turn made the code easier to write and maintain. Each concept or action was expressed in just one well-known place. Using MVC was like constructing a skyscraper with the girders already in place—it was a lot easier to hang the rest of the pieces with a structure already there. During the development of our application we will be making heavy use of Rails’ ability to generate scaffolding for our application.

In the same way that we used the rails command to create a new Rails application, we can also use a generator script to create a new controller for our project. This command is called rails generate. rb The rails generate command logs the files and directories it examines, noting when it adds new Ruby scripts or directories to your application. erb file. The first source file we’ll be looking at is the controller. rb. rb class SayController < ApplicationController def hello end def goodbye end end Pretty minimal, eh?

Erb template works. Each time we access this page, the user will see the current time substituted into the body of the response. And for our trivial application, that might be good enough. In general, though, we probably want to do something slightly different. We’ll move the determination of the time to be displayed into the controller and leave the view with the simple job of displaying it. 0 printing, October 28, 2010) H ELLO , R AILS ! 45

It is now <%= @time %>

When we refresh our browser window, we will again see the current time, showing that the communication between the controller and the view was successful.

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