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Installing Ruby
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Before you install Ruby, you need to install a few libraries required by the components you re installing. Enter the following command: $ sudo apt-get install build-essential libssl-dev libreadline5 libreadline5-dev zlib1g zlib1g-dev You install Ruby 1.9 from source; use the following commands to download and install Ruby and its friends:
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mkdir ~/src && cd ~/src wget ftp://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.1-p376.tar.gz tar -zxvf ruby-1.9.1-p376.tar.gz cd ruby-1.9.1-p376 ./configure && make && sudo make install
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This instructs the computer to get the latest version of Ruby 1.9 from the Internet, extract the contents of that file to the disk, and compile and install it to the disk. You can test that this is working by asking Ruby for its version number: $ ruby --version ruby 1.9.1p376 (2009-12-07 revision 26041) [i686-linux] Next, make sure the instance of Ruby that the shell is finding is the one you expect, which should bein /usr/local/bin/ruby: $ which ruby /usr/local/bin/ruby
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Updating RubyGems
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Ruby uses a package-management system called RubyGems (http://rubyforge.org/project/rubygems) to manage the installation and maintenance of Ruby programs and libraries. Updating RubyGems is straightforward. Enter the following commands in a Terminal window, and you re good to go: $ sudo gem update --system $ sudo gem sources -a http://gemcutter.org
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Installing Rails
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Now that RubyGems is up to date, you can use it to install the Rails framework. Enter this command: $ sudo gem install rails After spitting out some text to the screen and generally chugging away for a little while, the gem program should exit with a message like the following: Successfully installed rails-3.0 You can verify this claim by asking Rails for its version number:
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GETTING STARTED
$ rails --version Rails 3.0 $ which rails /usr/local/bin/rails With Ruby and Rails happily installed, you re ready to move on to the next step: installing SQLite.
Installing SQLite
To install SQLite with apt-get, issue the following command: $ sudo apt-get install sqlite3 libsqlite3-dev If all goes according to plan, you can test your SQLite3 installation by invoking the sqlite3 program and asking for its version number: $ sqlite3 --version 3.6.16 Now that you ve installed SQLite, let s install its Ruby binding a Ruby library that allows you to talk with SQLite. To install the SQLite3 Ruby binding, issue the following gem command from the command prompt: $ sudo gem install sqlite3-ruby With Ruby, Rails, and SQLite happily installed, it s time to take them for a test drive.
Creating Your First Rails Application
You ll start by using the rails command to create a new Rails project. Go to the directory where you want your Rails application to be placed; the rails command takes the name of the project you want to create as an argument and creates a Rails skeleton in a new directory by the same name. The newly created directory contains a set of files that Rails generates for you to bootstrap your application. To demonstrate, create a new project called (what else ) hello:
GETTING STARTED
$ rails new hello create create create create create create create create create create create create create vendor/plugins vendor/plugins/.gitkeep README Rakefile config.ru .gitignore Gemfile app app/controllers/application_controller.rb app/helpers/application_helper.rb app/views/layouts/application.html.erb app/mailers
If you look closely at the output, you see that the subdirectories of app/ are named after the MVC pattern introduced in 1. You also see a name mentioned briefly in 1: helpers. Helpers help bridge the gap between controllers and views; 6 talks about them. Rails generated a new directory called hello. If you look at the folder structure, you see the following: Gemfile README Rakefile app config config.ru db doc lib log public script test tmp vendor
Starting the Built-In Web Server
Next, let s start up a local web server so you can test your new project in the browser. True, you haven t written any code yet, but Rails has a nice welcome screen that you can use to test whether the project is set up correctly. It even gives you some information about your Ruby environment. Rails ships with a built-in, zero-configuration, pure Ruby web server that makes running your application in development mode incredibly easy. You start up the built-in web server using the rails server command. To start the server now, make sure you re inside the directory of your Rails application, and then enter the following commands:
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