ruby on rails - How to find unused gems in my Gemfile

Question

How to find unused gems in my Gemfile, so that I can cleanup references which are no longer used.

question from:https://stackoverflow.com/questions/14333963/how-to-find-unused-gems-in-my-gemfile

Answer 1

I doubt if there is an automated way to find unused gems in the Gemfile.

For someone who has built the application over time, it should be easy to manually identify gems that were discarded along the way for some reason or the other.

For a legacy application inherited from someone else, it is a much difficult task to manually identify unused gems. If there is comprehensive test coverage for the system, it would help in removing unused gems by trial and error, while ensuring that the tests pass at each change in the Gemfile.