Ruby on Rails - Ruby on Rails Bundler - ruby on rails tutorial - rails guides - rails tutorial - ruby rails



What is Ruby on Rails Bundler?

  • In Rails, bundler provides a constant environment for Ruby projects by tracking and installing suitable gems that are needed.
  • It manages an application's dependencies through its entire life, across many machines, systematically and repeatably.

What is gem install bundler?

  • The gem bundler bundles all the suitable gems your application is based upon.
  • Bundling Rails and other dependencies increases slug size by a few megabytes.
  • Increased slug size is a worthwhile tradeoff for simplified dependency management, as well as flexibility of being able to use any version of Rails you wish.

To not install a group of gems, use the BUNDLE_WITHOUT config var.

Bundler Version

  • Different versions of bundler have different bugs and behavior.
  • Bundler versions generally take a large amount of verification and Validation and are released infrequently

Bundler Version Issues

Different bundler versions have different bugs.

Bundler 1.13.6:

  • If you are using an older version of bundler, it allows you to have a version of Ruby in your Gemfile.lock file.
  • It is not valid according to the Ruby declaration in your Gemfile.

You will get the following error:

  • Your Ruby version is 2.2.5, but your Gemfile specified 2.3.1

You need to upgrade to latest bundler.

Bundler 1.13.1:

You will get the following error:

  • Bundler Output: requires_greater_than_equal_ruby_two_two
  • requires ruby version >= 2.2.2, which
  • is incompatible with the current version, ruby 2.1.7p400

You need to upgrade your Ruby version to be compatible with minimum Ruby version specified in your gems.

Bundler 1.11.2:

Some times your application may be running with a gem that currently does not have a valid gemspec.


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