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![codes: [ “foo”, “bar” ]
obj.as[BasicDBList]("codes")
.toList
.map(_.asInstanceOf[String])
Don’t make me think](https://image.slidesharecdn.com/nosql-meetup-120412010754-phpapp01/85/Mongo-20-320.jpg)
![obj.insert[Metadata]
("metadata", doc.metadata)
obj.extract[Metadata]
("metadata")
Doesn’t make me think!](https://image.slidesharecdn.com/nosql-meetup-120412010754-phpapp01/85/Mongo-27-320.jpg)
Uploaded byWilfred Springer
Mongo
This document discusses NoSQL databases and the Mongo database. It provides comparisons of different Mongo drivers in Scala, including Casbah and Salat, and discusses challenges with object mapping and versioning when using Mongo. Key topics covered include NoSQL, Mongo, Scala drivers for Mongo like Casbah and Salat, object mapping, and challenges with versioning in Mongo.
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- 16. Java driver ✗ Easyto 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 ✗ Easyto 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 touse, 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 touse, 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 touse, 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 touse, 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 ?
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- 27. obj.insert[Metadata] ("metadata", doc.metadata) obj.extract[Metadata] ("metadata") Doesn’t make me think!
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- 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” }
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- 37. ♥ Scala ♥ Mongo ☹Libraries ✎ Versioning D.I.Y. ☼ Composition