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(perhaps unnecessarily). Since every release belongs to a movie, you could treat them as nested resources to create a new release for the movie with ID 1, with this approach, you would POST to /movies/1/ releases, instead of to /releases (with a movie_id parameter of 1). In this particular case, there isn t much difference but as you ll see later in the chapter, nesting resources can actually make your application more comprehensible.

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In Line 099, the form variable 'extent' is retrieved and its four components split into array extent. The elements of extent are then used by the mapObj method setExtent() to set the extent of the map. Recall that when this script is executed, the extent of the map is initially set to the default value specified in the mapfile. Of course, on the previous invocation, it likely had some other value. This value would have been saved as a space-delimited string in the hidden variable extent. It s not until this point in the script that the value of this variable is retrieved, parsed, and used to set the extent to its previous value in Lines 103 and 104. 099 100 103 104 if parms.getfirst('extent'): extent = parms.getfirst('extent').split(' ') map.setExtent(float(extent[0]),float(extent[1]), \ float(extent[2]),float(extent[3]))

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In this example, you are using the component to show a message only when the request is being processed because you set startText. It s also possible to set stopText. In this case, before the request is sent and after the request is done, the stopText message will be displayed. Here are just the changes to the <a4j:status> component: <a4j:status id="stateStatus" startText="Working..." startStyle="background-color:#ffA500" stopText="Done..." stopStyle="background-color:#c0c0c0"/> You can use startStyle (or startStyleClass) and stopStyle (or stopStyleClass) to define the look and feel of the message. Here s what it looks like:

The last resource to add is the notification this is the link between a user and the release of a movie she is interested in. The only action the system will allow for notifications is index a simple list of all the releases a given user cares about. For that, then, the resource generator would suffice but since you don t even need an ActiveRecord model to back up the Notification resource, you can actually use the controller generator: ruby script/generate controller Notifications index The controller generator does not provide many of the files produced by the scaffold (or even resource) generator; basically, it just gives you a controller, a helper, a functional test, and views for whatever actions you specify in the command. In this case, then, there are just a couple of files to update. First, you need to add an entry to the routes file (since the controller generator doesn t do that for you), as shown in Listing 3-41. Listing 3-41. Adding the notifications resource declaration to config/routes.rb ActionController::Routing::Routes.draw do |map| map.resources :notifications # ... end Even though you ll only be using the index action, it s quicker to declare the route using map.resources instead of explicitly, as you saw in the last chapter. Once you have the route, you can add the view, as in Listing 3-42. Listing 3-42. Completed app/views/notifications/index.html.erb <h1>Listing notifications</h1> <table> <tr> <th>Movie</th> <th>Format</th> <th>Released on</th> </tr>

A rectObj() object containing the current extent is required by the zoomPoint() method used in the following code therefore, the elements of the extent array are used to set the values of the components of the rectObj old_extent in Lines 107 through 110. 107 108 109 110 old_extent.minx old_extent.miny old_extent.maxx old_extent.maxy = = = = float(extent[0]) float(extent[1]) float(extent[2]) float(extent[3])

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