I recently released version 1.0 of Cequel
(https://github.com/cequel/cequel), a Ruby ORM for Cassandra using CQL3.
Version 1.0 exposes the rich data-modeling capabilities of CQL3,
including parent-child relationships using compound primary keys, and
collection columns with atomic updates. Here’s a short slideshow
demonstrating its use: http://cequel.github.io
I’d much appreciate any feedback about the library, as I intend to
continue developing and extending it. Thank you!