Using Bundler to Manage Groups of Gems
Gems are pretty great, and any reasonably sized Ruby program will likely depend on many of them, each of which may have its own gem dependencies. This can easily become a management problem in and of itself. How can you have multiple programs on one machine that might use different versions of a gem? Or, because gems change all the time, how can you guarantee that everybody working on the application will be using the same set of gems?
The answer to both of these questions and many more is Bundler.[22] Bundler is itself a Ruby gem, and it manages a manifest file of the gems and versions in use on a project. Bundler allows you to specify the versions in use and limit your Ruby programs to only find the specific ...
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