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The most common motivation to use Rails is that it removes a lot of the groundwork necessary to develop Web applications using other technologies. Features such as database access, dynamic page elements (using Ajax Asynchronous JavaScript and XML), templating, and data validation are either preconfigured or take only a few lines of code to configure. Rails also encourages good development practices. All Rails applications come with support for unit testing (among other forms of testing), and Rails guiding principles are Don t Repeat Yourself (known as DRY) and Convention Over Configuration.
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CHAPTER 13 RUBY ON RAILS: RUBY S KILLER APP
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Figure 13-1. The interactions between users, views, controllers, and models
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Installing Rails
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The Rails framework is made up of several different libraries, but it s simple to install because all the parts are distributed as RubyGems. For completeness, though, the following is a list of Rails constituent libraries: Rails: The core library of the Ruby on Rails framework that ties the other libraries together. ActionMailer: A library that makes it easy to send e-mail from Rails applications. A basic overview of ActionMailer, including how to use it to send mail separately from Rails, is given in 14.
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ActionPack: A library providing useful methods used in views and controllers to generate HTML and dynamic page elements, such as Ajax and JavaScript, or manage data objects. ActionWebService: Provides methods to make it easy to offer functionality from your Rails application as a Web service. This section of Rails is being removed as of Rails 1.2 in favor of alternative techniques, but it s mentioned here for completeness. ActiveRecord: An object-relational mapper (ORM) that ties database tables to classes. If you have an ActiveRecord object that references a row in a database table, you can work with that object as you would any other Ruby object (by using attributes and other methods), and changes will be stored in the relevant database table. A basic overview of ActiveRecord was given in 9. ActiveSupport: A library that collects a number of support and utility classes used by various Rails features. For example, ActiveSupport implements many useful methods for manipulating times, numbers, arrays, and hashes. Generally you won t need to know or care about each of these elements as a discrete library because you can install them all at once using RubyGems, like so:
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gem asks you if you want to install each of the libraries one by one (you can skip this by using gem install --include-dependencies rails instead), then gem installs each of them along with their documentation. If you are confident about installing Ruby libraries by this point, these instructions might be enough for you to have a basic installation of the Rails framework in place. However, there are easier alternatives that can simplify the process in Windows or on Mac OS X. Windows users can install Instant Rails (http://instantrails.rubyforge.org/), a one-stop Rails installation solution that includes Ruby, Rails, Apache, and MySQL, all preconfigured and ready to run out of the box. These elements are kept separate from your usual installations, so you can begin developing Rails applications immediately. This system is ideal to tide you over if you have problems installing Rails and/or MySQL normally. Mac users can install Locomotive (http://locomotive.raaum.org/), which provides the same features as Instant Rails, but on OS X. Locomotive will get your Mac running with Rails without breaking any existing configuration or tools you have installed.
CHAPTER 13 RUBY ON RAILS: RUBY S KILLER APP
Database Considerations
As Rails is used primarily to develop data-driven Web applications, it s necessary to have a database system available to use on your computer. Instant Rails and Locomotive users have MySQL installed automatically, but if you don t have a database system installed you ll need to obtain one. Database engines are covered in 9, and you can use all those covered (MySQL, SQLite, PostgreSQL, Oracle, and Microsoft SQL Server) with Ruby on Rails. However, most developers use MySQL or PostgreSQL, as Rails supports these database engines best. You often have to make hacks and tweaks to have your Rails application work with other database engines, which are beyond the scope of this chapter. This chapter assumes you have a MySQL server present on your local machine that Rails applications can use. If you don t, you can download and install the community edition of MySQL for free by visiting http://dev.mysql.com/downloads/mysql/5.0.html.
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