I tested tus protocol with shrine.
and I followed tutorial this link
But on create action(app/controllers/albums_controller.rb) ocuured error
undefined method `close' for nil:NilClass Did you mean? clone
On debugging error occured this line
https://github.com/janko-m/shrine/blob/master/lib/shrine.rb#L721
How to fix my code?
My github code is
https://github.com/ggomagundan/shrine-rails-example
initializer : config/initializers/shrine.rb
uploader: app/uploader/image_uploader.rb
appliationjs: app/assets/javascripts/application.js