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Bundler2 is not a technology that is specific to Rails 3, but it is the preferred way to manage your application s gem dependencies Applications generated with Rails 3 use Bundler automatically, and you should not need to install the bundler gem separately since it s a dependency of Rails 3 itself Since we believe that you should use Bundler, figuring out how to not use Bundler is left as an exercise for adventurous and/or nonconformist readers One of the most important things that Bundler does is dependency resolution on the full list of gems specified in your configuration, all at once This differs from the one-at-a-time dependency resolution approach employed by Rubygems and previous versions of Rails, which can (and often did) result in the following hard-to- fix problem: Assume that your system had the following Rubygem versions installed
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activesupport 30pre activesupport 234 activemerchant 142 rails 234
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It turns out that activemerchant 142 depends on activesupport >= 232, therefore when you load it using the gem command (from the RubyGems library) like this
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gem "activemerchant", "142"
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it results in the loading of activemerchant, as well as the latest compatible versions of its dependencies, including the activesupport 30pre gem, since it is greater than or equal to version 232 Subsequently, trying to load rails itself with
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gem "rails", "234"
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1 http://railstutorialorg 2 http://gembundlercom
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results in the following exception at runtime:
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can't activate activesupport (= 234, runtime) for ["rails-234"], already activated activesupport-30pre for ["activemerchant-142"]
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The exception happens because activemerchant has a broader dependency that results in the activation of a version of activesupport that does not satisfy the more narrow dependency of the older version of Rails Bundler solves this problem by evaluating all dependencies at once and figuring out exactly the right versions of gems to load For an interesting perspective concerning the way that Bundler was conceived and how it contrasts with gem environment managers such as rip, make sure to read Yehuda s blog post on the subject3 Xavier says
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Bundler is a strong default in Rails 3, but you can easily opt-out The rails command has a flag to disable Gemfile generation If your app already has a Gemfile, it is enough to delete it to stop depending on Bundler Rails bootstrapping routines check whether the Gemfile exists, and if it does not then Bundler is not used
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Once you need gems other than those belonging to Rails itself, you ll need to introduce a Ruby-based manifest file named Gemfile into the root of your Rails project directory The basic syntax for the Gemfile is super simple:
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gem "nokogiri" gem "geokit"
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To load a dependency only in a specific environment, place it in a group block specifying one or more environment names as symbols:
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group :test do gem "rspec" gem "faker" end group :development, :test do gem "wirble" gem "ruby-debug" end
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3 http://yehudakatzcom/2010/04/21/named-gem-environments-and-bundler/
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1: Rails Environments and Configuration
The gem directive takes an optional second argument describing the version of the Rubygem desired Leaving the version argument off will simply get the latest available stable version, which may not be the latest version available To include a release candidate or a pre-release gem you ll need to specify the version explicitly The format of the version argument matches the Rubygem versioning scheme to which you should already be accustomed
gem gem gem gem 'nokogiri', '142' 'faker', '> 03' 'decent_exposure', '~> 100rc1' 'rspec', '200beta20'
You can find full instructions on how to craft a version string in the RubyGems documentation4 Occasionally, the name of the gem that should be used in a require statement is different than the name of that gem in the repository In those cases, the :require option solves this simply and declaratively right in the Gemfile
gem 'sqlite3-ruby', :require => 'sqlite3'
Loading Gems Directly From a Git Repository Until now we have been loading our gems from http://rubygemsorg It is possible to specify a gem by its source repository as long as it has a gemspec text file in the root directory Just add a :git option to the call to gem
gem 'paperclip', :git => 'git://githubcom/thoughtbot/paperclipgit'