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 the files it created on my application  In other words  I want to restore the system to what it used to be before the gem  How can I do this   I m using Ruby on Rails 3

User · Accepted Answer

Devise uses some generators to generate views and stuff it needs into your application. If you have run this generator, you can easily undo it with

rails destroy <name_of_generator>

The uninstallation of the gem works as described in the other posts.

User · Answer

You can use  gem uninstall  lt gem-name gt

User · Answer

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

User · Answer

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

User · Answer

For Rails 4 - remove the gem name from Gemfile and then run bundle install in your terminal  Also restart the server afterwards

User · Answer

You are using some sort of revision control  right  Then it should be quite simple to restore to the commit before you added the gem  or revert the one where you added it if you have several revisions after that you wish to keep

[ruby-on-rails] How to remove gem from Ruby on Rails application?

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