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Intro to Neo4j with Ruby


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A quick introduction to Graphs, Neo4j and neography.

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Intro to Neo4j with Ruby

  1. 1. Introducing Neo4j Your Next Database Max De Marzi
  2. 2. About Me Built the Neography Gem (Ruby Wrapper to the Neo4j REST API) Playing with Neo4j since 10/2009• My Blog:• Find me on Twitter: @maxdemarzi• Email me:• GitHub:
  3. 3. Agenda• What is a Graph?• What is a Graph Database?• What can you do with a Graph Database?
  4. 4. What is a Graph?• An abstract representation of a set of objects where some pairs are connected by links. Object (Vertex, Node) Link (Edge, Arc, Relationship)
  5. 5. Different Kinds of Graphs• Undirected Graph• Directed Graph• Pseudo Graph• Multi Graph• Hyper Graph
  6. 6. More Kinds of Graphs• Weighted Graph• Labeled Graph• Property Graph
  7. 7. What is a Graph Database?• A database with an explicit graph structure• Each node knows its adjacent nodes• As the number of nodes increases, the cost of a local step (or hop) remains the same
  8. 8. Good For• Highly connected data (social networks)• Recommendations (e-commerce)• Path Finding (how do I know you?)• A* (Least Cost path)• Data First Schema (bottom-up, but you still need to design)
  9. 9. Not so good for• Set Operations: – Union – Intersection – Cross Joins• Ginormous Amounts of Data – Billions ok, Trillions not so much.
  10. 10. What is Neo4j?• A Graph Database + Lucene Index• Property Graph• Full ACID (atomicity, consistency, isolation, durability)• High Availability (with Enterprise Edition)• 32 Billion Nodes, 32 Billion Relationships, 64 Billion Properties• Embedded Server• REST API
  11. 11. Neo4j + Ruby
  12. 12. Neo4j Data Browser
  13. 13. Neo4j Console
  14. 14. Friends Graph Illustrated
  15. 15. Friends Graph
  16. 16. Relationships.both is actually creating two relationships.One incoming and one outgoing friends relationship.Each Relationship in Neo4j only goes in one direction.
  17. 17. Friends of Friends
  18. 18. All Simple PathsSimple paths means no loops allowed
  19. 19. Shortest Path
  20. 20. Cypher : Neo4j Query LanguageASCII ART FTW: a--b, a-->b, a<--c
  21. 21. Neoflix: Movie Recommender
  22. 22.
  23. 23. Neo4j and Heroku Challenge
  24. 24. Questions? ?
  25. 25. Thank you!