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CHAPTER 1 INTRODUCING THE RAILS FRAMEWORK
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see and interact with. The MVC pattern helps by keeping programming logic out of the view. With this strategy in place, programmers get to deal with code, and designers get to deal with HTML. Having a clean environment in which to design the HTML means better interfaces and better software.
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The Libraries That Make Up Rails
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Rails is a collection of libraries, each with a specialized task. Assembled together, these individual libraries make up the Rails framework. Of the several libraries that compose Rails, three map directly to the MVC pattern: ActiveRecord: A library that handles database abstraction and interaction. ActionView: A templating system that generates the HTML documents that the visitor gets back as the result of a request to a Rails application. ActionController: A library for manipulating both application flow and the data coming from the database on its way to being displayed in a view. These libraries can be used independently of Rails and of each other. Together, they make up the Rails Model-View-Controller development stack. Since Rails is a full-stack framework, all the components are integrated, so you do not need to set up bridges between them manually.
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Rails Is No Silver Bullet
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There is no question that Rails offers web developers a lot of benefits. In fact, after having used Rails, it s hard to imagine going back to web development without it. Fortunately, it looks like Rails will be around for a long time, so there s no need to worry. But it brings us to an important point. As much as we ve touted the benefits of Rails, it s important that you realize that there are no silver bullets in software design. No matter how good Rails gets, it will never be all things to all people, and it will never solve all problems. Most important, Rails will never replace the role of the developer. Its purpose is merely to assist developers in getting their job done. Impressive as it is, Rails is merely a tool, which when used well can yield amazing results. It is our hope that as you continue to read this book and learn how to use Rails, you ll be able to leverage its strength to deliver creative and high-quality web-based software.
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CHAPTER 1 INTRODUCING THE RAILS FRAMEWORK
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This chapter provided an introductory overview of the Rails landscape, from the growing importance of web applications to the history, philosophy, evolution, and architecture of the framework. You learned about the features of Rails that make it ideally suited for agile development, including the concepts of less software, convention over configuration, and DRY. Finally, you learned the basics of the MVC pattern, and received a primer on how Rails does MVC. With all this information under your belt, it s safe to say you re ready to get up and running with Rails. The next chapter will walk you through Rails installation, so you can try it for yourself and see what all the fuss is about. You ll be up and running with Rails in no time.
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Getting Started
or various reasons, Rails has gained an undeserved reputation of being difficult to install. We want to dispel this myth. The truth is that installing Rails is relatively easy and straightforward, provided you have all the right ingredients. Here, we ll begin with an overview of what you ll need to get Rails up and running, and then provide step-by-step instructions for actual installation. Finally, we ll get you started with your first Rails application.
An Overview of Rails Installation
The main ingredient you need for Rails is, of course, Ruby. If you re lucky, Ruby might already be installed on your system, in which case, you re halfway there. Most likely, however, it s not. You ll therefore need to install it. Once you have Ruby installed, you ll be able to install a package manager (a program designed to help you install and maintain software on your system) called RubyGems. You ll use that to install Rails.
Note If you re using a version of OS X prior to 10.4.7, the Apple-provided version of Ruby on your computer might be ill-configured. You should follow the instructions for compiling your own version of Ruby to bypass the built-in one, as outlined in this chapter. Building your own Ruby installation is probably a good idea in any case, as it will keep you from being bitten by any changes to the built-in version of Ruby by future system updates from Apple.
If you re a Ruby hacker and already have Ruby and RubyGems installed on your computer, Rails is ridiculously easy to get up and running. Since it s packaged as a gem, you can install it with a single command:
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