But it does lead to some confusion.
If you stick a font into /app/assets/fonts how can you reference it in your CSS file?
Same goes for an image – after pre-processing where do they live?
Well, Rails offers you some helper methods to handle that for you.
Change your CSS to this:
font-family: 'RobotoDraft', sans-serif;
src: font_path('RobotoDraft') format('woff');
and Rails will figure it out for you. And for images, you can use image_path too.