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CHAPTER 6 ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
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Take a minute to examine these definitions. They re pretty straightforward. There s a route to match the login URL, which will look like /login, as well as the /logout route, the /signup route, and so on. When a URL comes in that matches any of these patterns, we re forwarding it along to a specific controller and action. If the incoming URL matches none of these patterns, it will fall through to the default route (:controller/:action/:id), which will hand it off to the controller and action specified by the positional arguments in the URL, if they exist. If no controller or action that matches the URL exists, an error will be generated. You can handle an empty request for the root of your application s domain using map.root and specifying an empty pattern to match. In our events application, we want the root URL (http://localhost:3000) to connect to the list of events. To accomplish this, we ll add a route like the following and make it the first route:
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map.root '', :controller => 'events', :action => 'index'
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Caution In edge-Rails, map.root receives a special designation and works without the empty pattern
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to match (""). If you get an error when using map.root, remove the empty pattern so the route looks like map.root :controller => 'events', :action => 'index'.
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The :action => 'index' parameter is actually redundant; taking a hint from most web servers, Rails assumes the index action if none is specified. Speaking of web servers, since the server looks for matching static files located in the /public directory before ever invoking Rails, and since there s a default index.html file there (it s the Rails welcome page you saw in 2), we ll need to delete it before our default route will take effect. Static files, like those located in /public, are served by the web server independently of Rails. This means images, style sheets, and JavaScript files are all served in this manner, without any server-side processing, (which, by the way, is why we call them static). So, go ahead and delete public/index.html now. Listing 6-1 shows our final routes file, minus some of the comment clutter. Make sure yours looks just like this before you move on.
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Listing 6-1. The config/routes.rb File
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ActionController::Routing::Routes.draw do |map| map.root, '', :controller => 'events' map.login 'login', :controller => 'users', :action => 'login' map.logout 'logout', :controller => 'users', :action => 'logout' map.signup 'signup', :controller => 'users', :action => 'new'
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CHAPTER 6 ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
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map.events map.new_event map.edit_event map.event
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'events', 'events/new', 'events/edit/:id' 'events/show/:id',
:controller :controller :controller :controller
=> => => =>
'events' 'events', :action => 'new' 'events', :action => 'edit' 'events', :action => 'show'
# Install the default route as the lowest priority. map.connect ':controller/:action/:id' end
Now that we have some routes defined, let s move on to creating the controllers and actions that will ultimately respond to these routes. Ready Let s go!
Generating a Controller
It s time to create our first controller from scratch. If you haven t noticed already, Rails ships with generators for most common tasks, and controllers are no exception. The syntax for the controller generator is as follows:
$ ./script/generate controller ControllerName [actions] [options]
As a minimum, the controller generator takes the name of the controller as an argument, which you can specify using either CamelCase (sometimes called MixedCase) or underscore_case. The generator also takes an optional list of actions to generate. For every action you specify, you ll get an empty method stub in the controller and a template in app/views/#{controller_name}. To see a list of all available options, you can run the generator without arguments.
The help output for the controller generator contains sample usage and options that you re sure to Tip
find interesting. All of the generators (and most UNIX commands, for that matter) respond to the --help argument (or variations thereof), so you re encouraged to try it whenever you re issuing a system command.
Generate the Users controller using the following command:
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