Be default, Refile does not have a way to secure file downloads. It relies on a generated hash that is unknown to users unless the page renders that image or has a download to that file. This is okay sometimes, however, protecting the file from being downloaded for those who have the URL is a bit more involved.

Using WebSockets, we are able to create a realtime notification between browsers. Useful for in-app messaging, chats, and more! Learn how to use Faye's Publish and Subscribe methods. I believe that this paves the way for successfully using and learning the upcoming ActionCable.

Using ClamAV, scan files uploaded to your application for viruses. In the event of a virus learn how to gracefully handle the infected file and notify the user.

Using the Javascript Library, Signature Pad, learn how to capture user signatures and store them within your Ruby on Rails application.

Developing a Ruby on Rails application on Windows can be difficult, but doesn't have to be with Bash on Windows. Learn how to use Bash to install the Ruby interpreter.