neo4j gem) is a Ruby wrapper for the Neo4j graph database.
It is a “Drop in” replacement for Rails Active Record.
As of Summer 2015, the master branch reflects v5 of the gem. See the first link below for information on its changes. Otherwise, the v3 documentation is accurate.
This gem is tested thoroughly and the specs make great documentation. In particular, see this for general examples but everything in https://github.com/neo4jrb/neo4j/tree/master/spec/e2e should be helpful.