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CHAPTER 6 ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
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Routing priority is based on the order in which routes exist in routes.rb, so that the first route defined has the highest priority. If an incoming URL matches the first route defined, the request will be sent along and no other routes will be examined. It s for this reason that we place the default route last. Routes are defined using the connect method. The first argument to connect is the pattern to match. The second argument is the request parameters to initialize in the form of a Ruby hash. Here s an example where we re matching a specific pattern and setting a hash of parameters in response:
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map.connect '/albums/list', :controller => 'albums', :action => 'list'
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This route will match a URL like http://example.com/albums/list and route the request to the list action on the albums controller. We can also set arbitrary parameters when using the route. For example, let s say we wanted to set a parameter called query that we could access and use in our controller.
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map.connect '/products/search/:query', :controller => 'products', :action => 'search'
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This route will match a URL like http://example.com/products/search/ipod, routing the request to the products controller and the search action. The third segment in the URL will be assigned to the :query parameter because we specified :query as an in-line variable. Routes can get quite complex, and it s possible to apply conditions and other forms of logic to them. For the most part though, you ll get a lot of mileage from the general cases we ve outlined here. The Rails API documentation (http://api.rubyonrails.org/ classes/ActionController/Routing.html) contains details on using the more complex routing features.
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Named Routes
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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. Instead of defining a route with map.connect, you replace the connect part with the name you want to give to the route. For example, let s take the albums route we defined in the previous section and turn it into a named route.
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map.albums '/albums/list', :controller => 'albums', :action => 'list'
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With this definition in place, Rails will create methods that allow us to reference this particular route using its name: albums_url and albums_path. The *_url variant returns a
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CHAPTER 6 ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
full URL including the protocol and hostname (http://example.com/albums/list), whereas the *_path variant returns just the path (/albums/list). We ll cover redirection methods and hyperlink generation helpers later in this chapter, but we ll point out now that you can use them with named routes:
link_to "Albums", albums_url #=> <a href="/albums/list">Albums</a>
This is more succinct than the alternative, which would involve specifying the parameters to identify the controller and action manually:
link_to "Albums", :controller => 'albums', :action => 'list' #=> <a href="/albums/list">Albums</a>
As you can see, the result is identical. However, the named route is shorter, DRYer, and impervious to changes made at the routing level. So, if you were to change the controller name from albums to records, you wouldn t need to update your links that use the named route; for the unnamed version, you would.
Configuring Routes for the Event Manager
Let s configure the routes we re going to be using in our events application. We haven t built all the controllers and actions yet (we ll do that next), but that shouldn t stop us from getting the routes in place. Open config/routes.rb in your editor. Start with the section that reads:
# Allow downloading Web Service WSDL as a file with an extension # instead of a file named 'wsdl' map.connect ':controller/service.wsdl', :action => 'wsdl'
We re not using the Web Service WSDL in our application, so you can safely delete these lines. In the cutting-edge version of Rails, this definition has become extinct, so don t be surprised if you don t see it in the file you re editing. Next, add the following routes, making sure they re above the default route (the very last one in the file):
map.login 'login', :controller => 'users', :action => 'login' map.logout 'logout', :controller => 'users', :action => 'logout' map.signup 'signup', :controller => 'users', :action => 'new' map.events map.new_event map.edit_event map.event 'events', 'events/new', 'events/edit/:id', 'events/show/:id', :controller :controller :controller :controller => => => => 'events' 'events', :action => 'new' 'events', :action => 'edit' 'events', :action => 'show'
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