List of gems and brief installation notes and examples for using Cassandra, CouchDB, and MongoDB from Ruby on Rails:
In order to do so, we will review the following NoSQL databases: Cassandra, MongoDB and CouchDB. Ruby supports each one of them over corresponding gems. In this blog post we will be using Ruby 1.8.7 with Rails 3.0 under Ubuntu 9.10 OS.
Original title and link: Ruby, Rails, and NoSQL: Cassandra, CouchDB, MongoDB (NoSQL databases © myNoSQL)