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CHAPTER 6 ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
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At this point, you might be wondering where the variable @events came into being. If you guessed in the controller, you would be right. The controller sets up instance variables that the view can access. In this case, the controller created a variable called @events and the view was given automatic access to it. Notice that the view doesn t perform any logic to fetch the list of events; it simply relies on the controller to have set up the variable and performs the display logic necessary to turn the collection into a browser-ready HTML list.
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The codes you see mixed into the HTML markup are actually Ruby. Since templates that are capable of dealing only with static HTML wouldn t be very useful, Action View templates have the benefit of being able to use Embedded Ruby (ERb) to programmatically enhance them. Using ERb, you can embed Ruby into your templates and give them the ability to deal with data from the controller to produce well-formed HTML representations. ERb is included in the Ruby standard library, and Rails makes extensive use of it. You trigger ERb by using embeddings such as <% %> and <%= %> in your template files to evaluate or print Ruby code, respectively. If you ve ever worked with ASP, JSP, or PHP, this style of embedding should be familiar to you. In the example in the preceding section, the loop is constructed within evaluation embedding tags (<% %>), and the event s title is printed using output embedding tags (<%= %>). Pay close attention to the subtle difference between the two embedding types: output embedding includes an equal sign; regular embedding does not. When you use output embedding, you re effectively saying print the results of the Ruby code when it s evaluated. Regular embedding does not print results; it simply evaluates whatever is in between the tags and goes on its merry way. If you mistakenly omitted the equal sign, no errors would be raised, but nothing would be printed either. You would have a set of empty list tags.
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The terms of the MVC are fairly strict in the way they advocate the separation of components. Controllers really shouldn t concern themselves with the generation of view code, and views shouldn t concern themselves with anything but the simplest of logic. While it s possible to use ERb to execute arbitrary Ruby code inside a view, and while controllers are certainly capable of generating markup, it s generally considered in violation of the MVC pattern to do so. This is where helpers come in to play. Action Pack s helpers do exactly what their name implies: they help views by providing a convenient location to encapsulate code that would otherwise clutter the view and
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CHAPTER 6 ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
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violate the terms of the MVC. They offer a middle ground between controllers and views and help to keep your application organized and easy to maintain. If you think about it, ERb tags really aren t the best place for performing complex logic, and templates can quickly become unwieldy when creating markup programmatically. For this reason, Action Pack includes a large suite of built-in helpers for generating all sorts of HTML fragments from creating forms and formatting dates, to making hyperlinks and image tags. And when the built-in helpers aren t enough, you can write your own. Each controller gets its own helper module that s mixed in automatically, ready to lend your templates a hand when they need it.
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All the information pertaining to which controller and action to call on comes in the form of the request URL. Action Pack includes a specialized component called routing, which is responsible for dissecting the incoming URL and delegating control to the appropriate controller and action. Every request that comes into your web application originates in the form of a URL. The routing system allows you to write the rules that govern how each URL is picked apart and handled. A traditional URL contains the path to a file on the server, relative to the server s home directory. Here s an example:
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