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Building a Basic Rails Application
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As explained in the previous section, Rails is popular because it makes developing Web applications easy. In this section I ll demonstrate that by showing you how to generate a basic Web application and looking through how it works.
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Creating a Blank Rails Application
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As you can use Rails to develop both small and large applications, different types of files are organized into different directories to keep elements separated for tidiness on large projects. A lot of pre-created files are also placed within a new, blank Rails project. The quickest way to look at these files and the overall directory structure is to leap right in and create a new Rails project. Your project in this chapter will be to create a simplistic online diary system, similar to a blog (or weblog). The resulting application will let you view your diary, and add, delete, or edit specific entries. The basic features of being able to Create, Read, Update, and Delete items are known as CRUD features, and most types of Web applications feature CRUD mechanisms at one level or another. For example, a photo gallery site allows you to add, view, edit, and delete photos, which are all CRUD actions. Therefore, the mechanics of developing a basic diary tool are easily transferable to developing most other types of Web applications.
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CHAPTER 13 RUBY ON RAILS: RUBY S KILLER APP
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When you installed Rails, a script called rails was also installed. You use the rails script to create new Rails projects, their default files, and their directory structure. To use it, navigate to a place in your filesystem where you would like to store Rails projects (possibly creating a rails directory in the process) and run rails, specifying an application name as the sole argument:
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app/controllers app/helpers app/models app/views/layouts config/environments components db doc lib lib/tasks log public/images public/javascripts public/stylesheets script/performance script/process test/fixtures test/functional test/integration test/mocks/development test/mocks/test test/unit vendor vendor/plugins tmp/sessions tmp/sockets tmp/cache Rakefile README app/controllers/application.rb
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CHAPTER 13 RUBY ON RAILS: RUBY S KILLER APP
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app/helpers/application_helper.rb test/test_helper.rb config/database.yml config/routes.rb public/.htaccess config/boot.rb config/environment.rb config/environments/production.rb config/environments/development.rb config/environments/test.rb script/about script/breakpointer script/console script/destroy script/generate script/performance/benchmarker script/performance/profiler script/process/reaper script/process/spawner script/runner script/server script/plugin public/dispatch.rb public/dispatch.cgi public/dispatch.fcgi public/404.html public/500.html public/index.html public/favicon.ico public/robots.txt public/images/rails.png public/javascripts/prototype.js public/javascripts/effects.js public/javascripts/dragdrop.js public/javascripts/controls.js public/javascripts/application.js doc/README_FOR_APP log/server.log log/production.log log/development.log log/test.log
CHAPTER 13 RUBY ON RAILS: RUBY S KILLER APP
A lot of files and directories are produced, but don t feel overwhelmed! You won t even use many of them in this chapter, as they are for more advanced uses that aren t relevant to basic Web application development. In most cases, Rails provides sane defaults anyway, so you don t need to change a lot of files unless you re doing something special. However, you ll explore what many of these directories are for in the following section.
Note The exact file and directory structure might vary on your system depending on what version of
Rails you re running. The preceding structure was generated by Rails 1.1.6, the official production release of Rails at the start of 2007.
Files and Directories Within a Rails Application
In this section we re going to go through the directories and files created by rails and look at what they re for. Don t become overwhelmed by this section. If there s something you don t understand, keep going, as most of the new terms and concepts mentioned here are explained as we use them throughout this chapter. rails generates the following main folders: app: This folder contains most of the Ruby source code and output templates directly associated with the application. It contains several other folders that I ll cover next. app/controllers: Contains the controller files. In an empty project, only application.rb exists. application.rb is an application-wide controller where you can define methods that all other controllers inherit. app/helpers: Contains helper files Ruby source code files that provide methods that you can use from views. app/models: Contains a file for each model in the application. In an empty project no models are yet defined, so this directory is empty. app/views: Contains the output templates (views) for the application. Typically each controller has its own folder under app/views, with templates located in those folders. There s also a layouts folder that Rails uses to store generic applicationwide templates.
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