How to remove gem from Ruby on Rails application?

Question

I have installed a gem on my Rails application (devise). After I installed the gem, I realized that I don\'t need it.

I want to remove the gem, its dependencies and

Answer 1

How about something like:

gem dependency devise --pipe | cut -d \  -f 1 | xargs gem uninstall -a

(this assumes that you're not using bundler - but I guess you're not since removing from your bundle gemspec would solve the problem)