Ohm is Ruby mapping library for Redis:
Most of the time we tend to think in terms of an RDBMS way, and this is in no way a negative thing. However, it is important to try and switch your frame of mind when working with Ohm (and Redis) because it will greatly save you time, and possibly lead to a great design.
I confess that I liked the blog design too.
Original title and link: Redis: Tagging Example with Ohm Framework (NoSQL databases © myNoSQL)