sunspot_rails

https://github.com/sunspot/sunspot

Sunspot::Rails is an extension to the Sunspot library for Solr search. Sunspot::Rails adds integration between Sunspot and ActiveRecord, including defining search and indexing related methods on ActiveRecord models themselves, running a Sunspot-compatible Solr instance for development and test environments, and automatically commit Solr index changes at the end of each Rails request.