Rails%203%20In%20Action

50 CHAPTER 3 Developing a real Rails application
Listing 3.3 Terminal
Counting objects: 73, done.
Compressing objects: 100% (58/58), done.
Writing objects: 100% (73/73), 86.50 KiB, done.
Total 73 (delta 2), reused 0 (delta 0)
To git@github.com:rails3book/ticketee.git
* [new branch] master -> master
Branch master set up to track remote branch master from origin.
The second to last line in this output indicates that your push to GitHub succeeded
because it shows that a new branch called master was created on GitHub. Next, you
must set up your application to use RSpec and Cucumber.
3.1.3 The Gemfile and generators
The Gemfile is used for tracking which gems are used in your application. The Bundler
gem is responsible for everything to do with this file; it’s the Bundler’s job to ensure that
all the gems are installed when your application is initialized. Let’s look at the following
listing to see how this looks inside (commented lines are removed for simplicity).
Listing 3.4 Gemfile
source 'http://rubygems.org'
gem 'rails', '3.1.0'
gem 'sqlite3'
group :assets do
gem 'sass-rails', " ~> 3.1.0"
gem 'coffee-rails', "~> 3.1.0"
gem 'uglifier'
end
gem 'jquery-rails'
group :test do
# Pretty printed test output
gem 'turn', :require => false
end
In this file, Rails sets a source to be http://rubygems.org (the canonical repository for
Ruby gems). All gems you specify for your application are gathered from the source.
Next, it tells Bundler it requires version 3.1.0.beta of the rails gem. Bundler
inspects the dependencies of the requested gem as well as all gem dependencies of
those dependencies (and so on), then does what it needs to do to make them available
to your application.
This file also requires the sqlite3 gem, which is used for interacting with SQLite3
databases, the default when working with Rails. If you were to use another database
system, you would need to take out this line and replace it with the relevant gem, such
as mysql2 for MySQL or pg for PostgreSQL.
The assets group inside the Gemfile contains two gems called sass-rails and
coffee-rails. The sass-rails gem provides a bridge into the sass gem, which