Gem Bundler is rapidly on its way to becoming the new community standard for managing gem dependencies in Ruby apps. Bundler is the default gem manager for Rails 3, but it will also work seamlessly with any other web framework (or no framework) since it has no dependencies itself.
Using it is as simple as creating a Gemfile in the root of your app: gem 'sinatra', '0.9.4' gem 'haml', '2.2.17' …and running “gem bundle” at the command line, which sets up all of your gems in vendor/gems. Heroku now has native support for gem bundler. If you push up a repo that has a Gemfile it its root, the slug compiler will bundle your gems automatically. (You can use this in addition to, or instead of, the .gems manifest. Both will be supported for the foreseeable future, so you needn’t feel pressured to switch.) Docs here: http://docs.heroku.com/gems#gem-bundler The Ruby community has been in need of a simple, standard, dependency-free gem dependency manager for a long time. Cheers to Yehuda Katz, Carl Lerche, and everyone else involved with bundler for delivering this elegant solution!
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