Domain Driven Design & NoSQL

I gave this presentation at the excellent RubyConf India.

Transcript

1. Escaping the Tower of Babel Domain Driven Design & NoSQL
2. class SpaceShuttle end ! class Astronaut end v I
3. Domain Driven Design • Find an ubiquitous language • The language is based on the domain • Every person involved understands the language Eric Evans
4. Iterative Development Close relationship between devs & domain experts Domain Driven Design
5. Hi. I’m Lucas.
6. I work for ArangoDB GmbH
7. We build ArangoDB
8. ArangoDB is an Open Source NoSQL Database
9. But what is NoSQL?
10. SQL NoSQL
11. SQL Not only SQL
12. What is NoSQL? What is SQL? What is a relational algebra? What is a relation? Not SQL A relational algebra An algebra on relations
13. {(Alice, 1983-07-1, 1) (Bob, 2014-03-19, 2)}
14. name birthday city Alice 1983-07-1 1 Bob 2014-03-19 2
15. Disconnect I v Ownership name: alice… type: spaceshuttle
16. Entity Value Object Service Identified by ID Value What it does State Mutable Immutable Stateless
17. + Factories + Repositories + Aggregates
18. DENORMALIZATION
19. Lift the restriction • Tuples containing other Tuples • Tuples with arbitrary attributes
20. Space Shuttle Parts
21. Space Shuttle Parts Document Store
22. I type: spaceshuttle v name: alice astronaut: 1 spaceshuttle: 3
23. JOINS
24. Alice Ownership SpaceShuttle
25. Alice Ownership SpaceShuttle Graph Database
26. Alice Ownership SpaceShuttle Parts
27. Alice Ownership SpaceShuttle Parts I’m a document!
28. Alice Ownership SpaceShuttle Parts Me too!
29. Alice Ownership SpaceShuttle Parts
30. Alice Ownership SpaceShuttle Parts Multi Model Database
31. Disconnect I v Ownership name: alice… type: spaceshuttle
32. I type: spaceshuttle v name: alice Ownership since: 2003
33. Explain graphs. Learn about the domain. Find the common language. Build one model for everyone involved. Evolve the model alongside the implementation moonglum moonbeamlabs arangodb.org