Agile Web Development with Rails 5, 1st Edition

Managing Dependencies with Bundler

Dependency management is a deceptively hard problem. During development, you may choose to install updated versions of gems that you depend on. Once you do this, you may find yourself not being able to reproduce problems that occur in production because your runs are picking up different versions of the gems your application depends on. Or perhaps you see problems that don’t exist in production.

It turns out that dependencies are every bit as important to manage as your application source code or database schemas. If you are developing as part of a team, you want every member of the team to be using the same version of the dependencies. When you deploy, you want to ensure that the version of the dependencies ...