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♥Mongo

♥Scala

Scala ⬍Mongo

Java driver✗ Easy to use, hard to misuse✗ When in Rome, do as the romans do✗ Dont make the client do anything the library could do

Java driver✗ Easy to use, hard to misuse✗ When in Rome, do as the romans do✗ Dont make the client do anything the library could do ☑

Casbah✗ Easy to use, hard to misuse✓ When in Rome, do as the romans do✗ Dont make the client do anything the library could do✗ Obey the principle of least astonishment

Casbah✗ Easy to use, hard to misuse✓ When in Rome, do as the romans do✗ Dont make the client do anything the library could do✗ Obey the principle of least astonishment Leaky abstractions

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

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”})

Casbah✗ Easy to use, hard to misuse✓ When in Rome, do as the romans do✗ Dont make the client do anything the✗ library could do Obey the principle of least astonishment ☑

Salat✗ Easy to use, hard to misuse✓ When in Rome, do as the romans do✓ Dont make the client do anything the✗✗✓ library could do Obey the principle of least astonishment Control Symmetry ☒

RogueBeaucatcher Lift Subset ?

Homegrown

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

Versioning

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

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

Rollback

Objectmapping

Subclasses indifferent collections

Conclusion

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

Mongo

by Wilfred Springer

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