simple-image-uploader

https://github.com/designium/simple-image-uploader

simple-image-uploader creates Image scaffold with file upload and removal. It is based on carrierwave and mini-imagegick gems. Image model, controller and form are have simple code that allows any application to use image upload immediately. Add simple-image-uploader gem to your Gemfile. Run bundle install. Then run 'rails g simple_image_uploader'. Run rails s and check http://localhost:3000/images.