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Using Groups

Grouping your dependencies allows you to perform operations on the entire group.
# These gems are in the :default group
gem "nokogiri"
gem "sinatra"

gem "wirble", :group => :development

group :test do
  gem "rspec"
  gem "faker"

Install all dependencies, except those in specified groups
$ bundle install --without test development

Require the gems in particular groups, noting that gems outside of a named group are in the :default group
Bundler.require(:default, :development)

Require the default gems, plus the gems in a group named the same as the current Rails environment
Bundler.require(:default, Rails.env)

Restrict the groups of gems that you want to add to the load path. Only gems in these groups will be require'able
require "rubygems"
require "bundler"
Bundler.setup(:default, :ci)
require "nokogiri"
Learn More: Bundler.setup