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ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
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NOTE Following the Model behaviour, Rails is modular and can be used with other templating libraries. A popular alternative is the Haml http://haml-lang.com template language used by many Rails developers.
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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. Although it s possible to use ERb to execute arbitrary Ruby code inside a view, and although 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 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: http://example.com/articles/show.asp id=1037 You can tell a lot from this URL. First, you know the server technology being used is Microsoft s ASP. Given that, you also know that this URL resolves to the show.asp script, which is inside the /articles directory. In this case, there is no URL rewriting going on; the mapping of the URL to the script that handles it is one to one. The problem with this kind of mapping is that you have no control over the URL. The URL is coupled to the script. What if you want to invoke the show.asp script, but want the URL to read articles/detail.asp instead of show.asp Or better yet, what if you don t want to expose the underlying script implementation (ASP) at all and use just articles/detail There s no way. The lack of flexibility in this kind of URL mapping is a problem. If you ever need to change the name of the script being invoked, you instantly break all the URL references. This can be a major pain if you need to update all your code, especially if your pages are indexed by search engines. Action Pack s routing solves this problem by decoupling the URL from the underlying program implementation. In Rails, the URL is related to the specific resource being requested, and it can be
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ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
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formatted to correctly identify that resource without having to conform to the name of the script that does the handling. When thought of in this way, URLs become part of the interface of an application, unrelated to the files that are ultimately invoked to process a request. There are myriad reasons why a routing system is a good idea. Here are just a few of them: Decoupled URLs can convey meaning, becoming part of the interface. Clean, readable URLs are more user-friendly and easier to remember. URLs can be changed without affecting the underlying implementation.
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Of course, like most things in Rails, the routing system is open to configuration; and one of the great benefits of routes is that because they re decoupled, they can be customized to create meaningful URLs without much effort. This chapter teaches you how to build and customize routes for your application, understand the default routes that Rails creates for you, create named routes, and use routes when creating links and redirects in your code.
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