I'm just learning Flask myself - are you using a database for storage? That's my next step. I've done full apps with RoR and this would not be a question at all with RoR, it's already built in, just toying with Python/Flask to learn stuff.
I'm a bit of a REST newbie and so some concepts (esp HATEOAS) are still a bit blurry. I would probably take a little time to dig into just what goes into a well-structured REST service.