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What is Bundler?
Bundler maintains a consistent environment for ruby applications. It tracks an application's code and the rubygems it needs to run, so that an application will always have the exact gems (and versions) that it needs to run.
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Getting Started
Getting started with bundler is easy! Open a terminal window and type the following:
$ gem install bundler
Specify your dependencies in a Gemfile in your project's root:
source "https://rubygems.org" gem "nokogiri" gem "rack", "~>1.1" gem "rspec", :require => "spec"Learn More: Gemfiles
Install all of the required gems from your specified sources:
$ bundle install $ git add Gemfile Gemfile.lockLearn More: bundle install
The second command adds the Gemfile and Gemfile.lock to your repository. This ensures
that other developers on your app, as well as your deployment environment, will all use
the same third-party code that you are using now.
Inside your app, load up the bundled environment:
require "rubygems" require "bundler/setup" # require your gems as usual require "nokogiri"Learn More: Bundler.setup
Run an executable that comes with a gem in your bundle:
$ bundle exec rspec spec/models
In some cases, running executables without bundle exec
may work, if the executable happens to be installed in your system
and does not pull in any gems that conflict with your bundle.
However, this is unreliable and is the source of considerable pain. Even if it looks like it works, it may not work in the future or on another machine.
Finally, if you want a way to get a shortcut to gems in your bundle:
$ bundle install --binstubs $ bin/rspec spec/models
The executables installed into
Learn More: Executables
bin are scoped to the
bundle, and will always work.
Use Bundler with
Learn about
Get involved
Bundler has a lot of contributors and users, and they all talk to each other quite a bit. If you have questions, try the IRC channel or mailing list. If you're interested in contributing to the project (no programming skills needed), read the contributing guide. If you have sponsorship or security questions, email us directly.
