carrierwave

https://github.com/carrierwaveuploader/carrierwave

Ruby

Classier solution for file uploads for Rails, Sinatra and other Ruby web frameworks

CarrierWave::Uploader::Versions#recreate_versions!

Recreate versions and reprocess them. This can be used to recreate
versions if their parameters somehow have changed.

Source | Google | Stack overflow

Edit

git clone [email protected]:carrierwaveuploader/carrierwave.git
cd carrierwave
open lib/carrierwave/uploader/versions.rb

Contribute

# Make a new branch
git checkout -b -your-name--update-docs-CarrierWave--Uploader--Versions-recreate_versions--for-pr

# Commit to git
git add lib/carrierwave/uploader/versions.rbgit commit -m "better docs for CarrierWave::Uploader::Versions#recreate_versions!"

# Open pull request
gem install hub # on a mac you can `brew install hub`
hub fork
git push <your name> -your-name--update-docs-CarrierWave--Uploader--Versions-recreate_versions--for-pr
hub pull-request

# Celebrate!