The Ruby programming language allows you to manage #key# project dependencies: also called gems #key# using the
gem command is very useful for distributing programs and libraries, such as the famous Ruby on Rails.
Gemfile is the core of a file the specifies the source of the packages, the packages, and the versions.
Take a look at the following example:
We have just created a project that only requires one library at version 1.2.
Bundler helps us with gem management. It create a Gemfile.lock file that can store more information about our project, such as:
- platform architecture
- bundler version
- gemfile source
- other information that can help when we need to replicate our environment
We can install it using:
$ gem install bundler
We just need to create our Gemfile (as shown above) and run:
$ bundle install
This command will generate our Gemfile.lock file. Now, we can be sure that our dependencies are present in development, staging, and production.