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One of the coolest things about routing in Rails is a feature known as named routes. You can assign a name to a given route to make referring to it in code easier. You still define the route the same way as a regular routes, but you need a new hash pair, where the key is :as and the value is the name of the route. For example, let s take the search route defined in the previous section and turn it into a named route: match '/teams/search/:query' => 'teams#search', :as => 'search' With this definition in place, Rails creates helper methods that allow you to reference this particular route using its name: search_url and search_path. The *_url variant returns a full URL including the protocol and hostname (http://example.com/teams/search), whereas the *_path variant returns just the path (/teams/search). Later, this chapter covers redirection methods and hyperlink-generation helpers. For now, note that you can use them with named routes:
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ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
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link_to "Search", search_path outputs <a href="/teams/search">Search</a> Named routes are shorter, DRYer, and impervious to changes made at the routing level. So, if you change the controller name from teams to cities, you don t need to update links that use the named route; for the unnamed version, you do.
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Earlier, the discussion of RESTful design said that information is dealt with in the form of resources. Rails makes it easy for you to do that: for every action in your controller, you have an associated named route to call. Resources are configured in the routes.rb file using the resources method. If you look at the routes file in your blog application, you see resources :articles at the top: it was added when you generated the articles scaffold in 3. The resources :articles method defines the following named routes for the articles controller: article_path => /articles/:id articles_path => /articles edit_article_path => /articles/:id/edit new_article_path => /articles/new The resources method generated four named routes for you; but when you open the ArticlesController, you have seven actions (see Table 6-1). How can you access the remaining actions Remember that when you learned about REST earlier, you saw that every operation is identified by both a URL and a request method. Using different request methods with the generated named routes, Rails routes them to the appropriate controller actions. Table 6-1. Articles Named Routes
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Request Method
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GET POST GET PUT DELETE GET GET
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articles_path articles_path article_path article_path article_path edit_article_path new_article_path
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Parameters
Record hash ID ID and Record hash ID ID
Controller Action
index create show update destroy edit new
ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
NOTE You can list all the available routes in your application by calling the rake routes command from the terminal.
By following the REST convention, instead of defining a named route for every action, you use the resources method in your routes file. To give some examples, if you want to access the index action in your articles controller, you go to /articles in your browser; the default request method when you type a URL in your browser is GET. What if you want to create a new article You can do that by submitting a form to /articles with the default request method for forms, POST. To get a specific article, type /articles/:id, where :id is your article id. It s that simple.
Configuring Routes for the Blog Application
Let s configure the routes to be used in your blog application. You haven t built all the controllers and actions yet (you do that next), but that shouldn t stop you from getting the routes in place. You can handle an empty request for the root of your application s domain using the root method. In the blog application, you want the root URL (http://localhost:3000) to connect to the list of articles. To accomplish this, you add a root declaration to your routes file and make it the first route. Make sure your config/routes.rb file looks like Listing 6-3 (note that all comments have been deleted). Listing 6-3. The config/routes.rb File: http://gist.github.com/330822 Blog::Application.routes.draw do root :to => "articles#index" resources :articles end Speaking of web servers, because the server looks for matching static files located in the /public directory before invoking Rails, and because there s a default index.html file (it s the Rails welcome page you saw in 3), you need to delete it before your default route takes 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 they re called static). Go ahead and delete public/index.html. Now that you have some routes defined, let s move back to the articles controller and try to understand its actions and templates.
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