By Dave Thomas
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Extra resources for Agile Web Development with Rails: A Pragmatic Guide
2 Hello, Rails! I can’t help it—I just have to write a Hello, World! program to try a new system. The equivalent in Rails would be an application that sends our cheery greeting to a browser. As we saw in Chapter 2, The Architecture of Rails Applications, on page 22, Rails is a Model-View-Controller framework. Rails accepts incoming requests from a browser, decodes the request to find a controller, and calls an action method in that controller. The controller then invokes a particular view to display the results to the user.
Rails is written in Ruby, and you’ll be writing your applications in Ruby too. The Rails team now recommends Ruby version 1. 4. 5. ) • Ruby on Rails. 2. • Some libraries. • A database. 22 in this book. For a development machine, that’s about all we’ll need (apart from an editor, and we’ll talk about editors separately). However, if you’re going to deploy your application, you’ll also need to install a production web server (as a minimum) along with some support code to let Rails run efficiently.
In this chapter, we describe the default mechanism. 2, Routing Requests, on page 394. methods ֒→ page 633 47 H ELLO , R AILS ! com/say/hello Create an instance of SayController class UserController def hello class SayController # code for o action def hello end class ProductController # code for hello action end def hello end class LoginController # code for hello action end def login end # code . . 3: Rails Routes to Controllers and Actions Now let’s try calling it. Navigate to the URL http://localhost:3000/say/hello in a browser window.
Agile Web Development with Rails: A Pragmatic Guide by Dave Thomas