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INTRODUCING THE RAILS FRAMEWORK
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some of the smartest programmers on the planet. Having been born in the 1970s, the UNIX operating system has evolved into a lean and powerful example of open source craftsmanship. UNIX s beauty, simplicity, and singularity of purpose isn t lost on the creators of Rails. Although there is a marked bias toward UNIX variants when it comes to Rails developers, make no mistake, Rails is truly cross-platform. With a growing number of developers using Rails in a Windows environment, Rails has become easy to work with in all environments. It doesn t matter which operating system you choose: you ll be able to use Rails on it. Rails doesn t require any special editor or IDE to write code. Any text editor is fine, as long as it can save files in plain text. The Rails package even includes a built-in, stand-alone web server called WEBrick, so you don t need to worry about installing and configuring a web server for your platform. When you want to run your Rails application in development mode, simply start up the built-in server and open your web browser. Why should it be more difficult than that The next chapter takes you step by step through the relatively painless procedure of installing Rails and getting it running on your system. But before you go there, and before you start writing your first application, let s talk about how the Rails framework is architected. This is important because, as you see in a minute, it has a lot to do with how you organize your files and where you put them. Rails is a subset of a category of frameworks named for the way in which they divide the concerns of program design: the Model-View-Controller (MVC) pattern. Not surprisingly, the MVC pattern is the topic of our next section.
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The MVC Pattern
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Rails employs a time-honored and well-established architectural pattern that advocates dividing application logic and labor into three distinct categories: the model, view, and controller. In the MVC pattern, the model represents the data, the view represents the user interface, and the controller directs all the action. The real power lies in the combination of the MVC layers, which Rails handles for you. Place your code in the right place and follow the naming conventions, and everything should fall into place. Each part of the MVC the model, view, and controller is a separate entity, capable of being engineered and tested in isolation. A change to a model need not affect the views; likewise, a change to a view should have no effect on the model. This means changes in an MVC application tend to be localized and low impact, easing the pain of maintenance considerably while increasing the level of reusability among components. Contrast this to the situation that occurs in a highly coupled application that mixes data access, business logic, and presentation code (PHP, we re looking at you). Some folks call this spaghetti code because of its striking resemblance to a tangled mess. In such systems, duplication is common, and even small changes can produce large ripple effects. MVC was designed to help solve this problem. MVC isn t the only design pattern for web applications, but it s the one Rails has chosen to implement. And it turns out that it works great for web development. By separating concerns into different layers, changes to one don t have an impact on the others, resulting in faster development cycles and easier maintenance.
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The MVC Cycle
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Although MVC comes in different flavors, control flow generally works as follows (see Figure 1-1): The user interacts with the interface and triggers an event (for example, submits a registration form).
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