How to reinstall a gem using bundler

If using rbenv, this will let you completely uninstall and re-install a gem such as rmagick:

First: Try a simple uninstall/reinstall

gem uninstall rmagick
bundle install

If that doesn't work, you can remove all trace of the installed gem. Find your gem installation location:

bundle show rmagick
BUNDLE_DIR=$(dirname $(dirname $(bundle show rmagick)))
echo $BUNDLE_DIR

Your gem installation prefix will either be the default e.g. ~/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0 or something you set e.g. .vendor

Clear out the gem directory:

rm -rf $BUNDLE_DIR/gems/rmagick-*

Clear out the compiled gem cache:

rm $BUNDLE_DIR/cache/rmagick*.gem

Also clear out bundler's spec cache:

rm $BUNDLE_DIR/specifications/rmagick*gemspec

Then you can re-install:

bundle install

You can always use:

gem pristine acts-as-taggable-on

pristine - Restores installed gems to pristine condition from files located in the gem cache

If you just want to restore the gem for the current project you should run:

bundle exec gem pristine acts-as-taggable-on

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