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CHAPTER
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Getting Something Running
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he best way to learn a programming language or a web framework is to dig in and write some code. After reading the first two chapters, you should have a good understanding of the Rails landscape. This chapter builds on that foundation by walking you through the construction of a basic application. You ll learn how to create a database and how to connect it to Rails, as well as how to use a web interface to get data in and out of the application. You ll receive a lot of information in this chapter, though not more than you can absorb, we hope. Our goal here is demonstrate, not to overwhelm. As you ll see, Rails makes it incredibly easy to get started, and that s a feature we want to highlight. There are a few places where Rails really shines, and getting something running is one of them. By the end of this chapter, you ll have a working web application to play with, explore, and learn from. We ll build on this application throughout the rest of the book, adding features and refining functionality.
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An Overview of the Project
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We re going to build a simple event-management system that will let us create and manage upcoming events, not unlike Upcoming.org or Evite. Our first iteration will focus on the basics: creating and editing events. Before we start coding though, let s sketch out a brief summary of the goals and flow of the application. We re going to stay at a very high level. The idea is not to focus on the nitty-gritty, but instead to concentrate on the general case. Our application will have two kinds of users: those who create events and those who wish to attend events. In some cases, people will play both roles. All users will need to create an account by registering on the site. It would also be nice if people could notify their friends of interesting events with a send to friend feature that sends out a friendly email notification to interested parties.
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CHAPTER 3 GETTING SOMETHING RUNNING
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These are some of the features we will add in later chapters. Other application requirements will likely come up as we continue, but these will be enough to get started. In the real world, specifications are seldom correct the first time around, so it s best not to dwell on them. You ll see right away that Rails doesn t penalize you for making changes to an application that s already under construction, so we can engage in an iterative style of development, adding and incrementing functionality as we go. We ll start with what matters most: events. You might be wondering why we don t start with users. After all, without users, who will create the events We could begin with users, but if you think about it, without events, what could users do Events are clearly the epicenter of the application, so it makes the most sense to start there and work out the details as we go. Ready Let s get started!
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Creating the Events Application
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As you saw in the previous chapter, the first step is to create a new Rails application. We could try to come up with a fancy Web 2.0 name, but instead we ll keep it simple and just call the application events. It s not going to win any awards for creativity, but it works. To get started, issue the rails command to generate the application skeleton and base files.
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$rails events
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create create create create create ...
app/controllers app/helpers app/models app/views/layouts
As you ll recall from our little example in 2, the rails command takes the name of the project you want to create as an argument and generates a directory of the same name that contains all the support files. In this case, it will create a subdirectory in dev called events. Change into the events directory and get oriented. Figure 3-1 shows the directory structure.
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