Seems like a good learning project, though for anyone else who wants a solution, there's a pretty popular IFTTT applet that does the same thing: https://ifttt.com/applets/47502738d-automatically-keep-a-pla...

This is something I made to learn Ruby on Rails, Spotify's Web API, and solve a problem I personally, had over winter break. It's really small and simple, but you gotta start somewhere