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

If you're using Rails 3+, remove the gem from the Gemfile and run bundle install.

If you're using Rails 2, hopefully you've put the declaration in config/environment.rb. If so, removing it from there and running rake gems:install should do the trick.