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You ve been introduced to the MVC pattern, but if you need a refresher, here it is. The model is your application s world, most often represented by database objects like articles, comments, and subscribers. The controller is the grand orchestrator, dealing with requests and issuing responses. The view is the code that contains instructions for rendering visual output for a browser, like HTML. Armed with this refresher, you may be able to guess what roles are played by Action Pack. This isn t a test, so here s the answer: Action Pack is the controller and the view. The controller performs the logic, and the view renders the template that is given back to the requesting browser. Not surprisingly, two of the modules that make up Action Pack are named accordingly: Action Controller and Action View. At this point, you may be wondering why the view and the controller are wrapped up in a single library, unlike models, which have a library of their own. The answer is subtle and succinct: controllers and views are very closely related. The pages that follow paint a more complete picture of both the role
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ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
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and the relationship of controllers and views, how they work, and how they work together to create and control the interface of a Rails application.
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Action Controller
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Controllers orchestrate your application s flow. Every time a user requests a page, submits a form, or clicks a link, that request is handled in one way or another by a controller. When you re programming your application, you spend a lot of time building controllers and giving them instructions on how to handle requests. The concept of controllers can sometimes be difficult for newcomers to grasp. Even if you ve built web applications before, say in ASP or PHP, you may not be used to this form of separation, where the mechanics of flow are controlled by a separate entity and not embedded in the pages themselves. Let s look at the example of the CD player in a car to illustrate the concept of controllers. The player is required to respond to certain events, such as the user pressing the Play button, fast forwarding, or rewinding a track. When you push a button, you expect something to happen you ve made a request, and you wait for the subsequent response. If your CD player was a Rails application, the instructions for what to do when a certain event takes place, such as the pressing of the Eject button, would be contained in a controller. If you were to sketch it on paper, it might look something like this: CD Player Play Stop Fast-forward Rewind Eject
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These events, or actions, describe what the player should be capable of doing. Obviously, each of these actions would need to be programmed to do something with the disc inside the player. When someone presses Eject, you would first call on the stop action (if the disc is playing) and then arrange for the player to spit out the disc. You would code all the instructions for dealing with an eject event into the controller specifically, inside the eject action. The same would apply for play, fast-forward, and rewind. It s worth noting that this type of logic has nothing to do with the CD itself, nor does it have anything to do with the music on the CD. If this were a Rails application, the CD would be the model. It can be used independently of the player. In fact, it can be used in all sorts of players, not just the one in your car. The stereo in your car is probably capable of more than just playing CDs. Most stereos have a radio receiver built in as well. The radio would have its own set of events that would likewise need to be handled. These actions might include things like changing stations, setting presets, and switching between AM and FM. To keep things well organized, you would probably want to group these actions inside their own controller, separate from the CD controller. After all, the radio and the CD player do different things. When you re dealing with a Rails application, it s not much different. You separate the things that you need your application to do with an object from the object itself. Even when you re not dealing directly with an object (adjusting the volume on your car stereo has little to do with either the CD in the player or the station on the radio), you still handle the event inside a controller.
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