Things we learned while using Mongo and Scala at Udini.

2. Papers

3. Articles

4. Dissertations

5. 144.000.000

7. NoSQL

8. no ␣ SQL

9. S3

10. ...

11. Mongo

12. ♥Mongo

13. ♥Scala

14. 1

15. Scala
⬍
Mongo

16. Java driver
✗ Easy to use, hard to misuse
✗ When in Rome, do as the romans do
✗ Don't make the client do anything
the library could do

17. Java driver
✗ Easy to use, hard to misuse
✗ When in Rome, do as the romans do
✗ Don't make the client do anything
the library could do ☑

18. Casbah
✗ Easy to use, hard to misuse
✓ When in Rome, do as the romans do
✗ Don't make the client do anything the library
could do
✗ Obey the principle of least astonishment

19. Casbah
✗ Easy to use, hard to misuse
✓ When in Rome, do as the romans do
✗ Don't make the client do anything the library
could do
✗ Obey the principle of least astonishment
Leaky abstractions

20. codes: [ “foo”, “bar” ]
obj.as[BasicDBList]("codes")
.toList
.map(_.asInstanceOf[String])
Don’t make me think

21. Casbah:
coll.findOne(“name” $ne “wilfred”)
Mongo:
db.coll.findOne({ name : { $ne : “wilfred” } })
☹ Casbah:
coll.findOne(
MongoDBObject(“name” -> “wilfred”)
)
Don’t make me think!
Mongo:
db.coll.findOne({ name : “wilfred”})

22. Casbah
✗ Easy to use, hard to misuse
✓ When in Rome, do as the romans do
✗ Don't make the client do anything the
✗
library could do
Obey the principle of least
astonishment
☑

23. Salat
✗ Easy to use, hard to misuse
✓ When in Rome, do as the romans do
✓ Don't make the client do anything the
✗
✗
✓
library could do
Obey the principle of least astonishment
Control
Symmetry
☒

24. Rogue
Beaucatcher
Lift
Subset ?

26. Homegrown

27. obj.insert[Metadata]
("metadata", doc.metadata)
obj.extract[Metadata]
("metadata")
Doesn’t make me think!

28. 2

29. Versioning

30. Version 1
{
street: “Lingedijk”,
housenumber: 132
}
⬍
Version 2
{ address: “Lingedijk 132” }

31. {
version: 1,
street: “Lingedijk”,
housenumber: 132
} Read time
➡ reconciliation
Memory
{
➡
version: 2,
address: “Lingedijk 132”
}

32. Rollback

33. 3

34. Object
mapping

35. Subclasses in
different collections

36. Conclusion

37. ♥ Scala
♥ Mongo
☹ Libraries
✎ Versioning D.I.Y.
☼ Composition