My friend got stuck in some weird problem yesterday.
Bundler version: 1.7.7
... Using slim-rails 3.0.1 Using zeroclipboard-rails 0.1.1 Using formtastic-bootstrap 3.1.1 Using query_report 1.2.1 Using rails 4.2.0 Using sass-rails 5.0.6 Using devise 3.4.1 Using wicked_pdf 0.11.0 ... Your bundle is complete! Gems in the groups development and test were not installed. Use `bundle show [gemname]` to see where a bundled gem is installed.
Some day he might have using this command
$ bundle install --without development
bundler remembers this command and does same with future commands as well
$ bundle install # remembers and includes --without development
This command will force bundler to forget the cached-switch
$ bundle install --without somerandomstring