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Neo4j.rb is a JRuby wrapper for the Neo4j graph database.

Why ?

• Whiteboard friendly – you use the language of graph (node, properties and relationship) to describe your domain as you already do on the whiteboard.
• Seamless integration with Ruby on Rails:
  • Example: rails new myapp -m http://andreasronge.github.com/neo4j/rails.rb
• Schema Less and Efficient storage of Semi Structured Information
• No O/R mismatch – very natural to map a graph to an Object Oriented language like Ruby.
• Performance
• Embedded Database – no database tier, easier to install, test, deploy and configure. It is run in the same process as your application.
• Express Queries as Traversals or Cypher DSL
  • Fast deep traversal instead of slow SQL queries that span many table joins.
  • Very natural to express graph related problem with traversals (recommendation engine, find shortest parth etc..)
• ACID Transaction with rollbacks support.