bundle install

What does the command:

bundle install


It seems also that it only works with Rails3?


First, you need to install the bundler gem

sudo gem install bundler

Then you need to add a Gemfile to your Rails app root folder (the one with all the folders in app/, lib/ etc).

In the Gemfile, you specify the gems your Rails app uses, for example:

gem “rails”, “2.3.4”

gem “rack”, “1.0.0”

if defined?(JRuby)

gem “activerecord-jdbcmysql-adapter”

gem “sequel” # for FAST import

else # native libraries cannot be compiled on jruby - too bad

gem “mysql”, “2.8.1”

gem “rmagick”, “2.9.1”, :require => ‘pp’ # hack to avoid all the constant errors before rake spec (env is required twice)


group :test do

gem “rspec”, “>=1.2.2”

gem “rspec-rails”, “>=1.2.2”

gem “factory_girl”, “>=1.2.3”

gem “rack-test”

gem “cucumber”, “>=0.6.4”

gem “cucumber-rails”

gem “pickle”

gem “launchy”

gem “database_cleaner”

gem “webrat” unless defined?(JRuby)

gem “selenium-client”


group :development do

gem “mongrel”, “>=1.1.5” unless defined?(JRuby)

gem “capistrano”

gem “capistrano_colors”, :require => ‘pp’ # only require when needed, produces errors on rake spec


When you have done so, “bundle install” will install the necessary gems and the right version and link it into your Rails app.