#Mongo4s A dsl to interact with MongoDB in scala using the ReactiveMongo library. This project is still in development but any requests are welcome. Feel free to file a bugs/enhancements into issues.
#Building/Sonatype This project is still in active development and doesn't have a stable version (yet). But its up on sonatype! Its cross-published against scala version 2.11.6 and 2.10.5 so it should work with both. The snapshot is not always up to date with whats in the repository. I'm sort of "dogfooding" this.
libraryDependencies += "com.github.kfang" %% "mongo4s" % "0.0.1-SNAPSHOT"#Why this project exists ##Reason 1 => Verbosity Rather than doing this:
collection.find(BSONDocument("field" -> "value")).options(QueryOpts(skipN = 12)).cursor[BSONDocument].collect[List](upTo = 24)I'd rather do this:
collection.execute(find("field" -> "value").skip(12).limit(24).asList)or if you don't like the dots:
collection.execute(find sel "field" -> "value" skip 12 limit 24 asList)##Reason 2 => CRUD I'm okay with the IFUR(insert/find/update/remove) paradigm but not everyone is familiar with it and I don't think it has a wikipedia page. But a lot people know CRUD(create/read/update/delete). The dsl provides the verbage to interface the two. For example, these two lines are the same:
find("field" -> "value")
read("field" -> "value")or
insert(BSONDocument("_id" -> 1))
create(BSONDocument("_id" -> 1))Better documentation will exist once more of this stuff is implemented but the basics are in the FindDsl.scala
#TODO
- Find DSL
- Insert DSL
- Delete DSL
- Update DSL
- Count DSL
- Distinct DSL
- '$' shortcuts (err.. 1/2? complete)
#Usage ##MongoConnPool The MongoConnPool contains your MongoConnection. For every set of nodes you need to attach to, you have one MongoConnection. This one MongoConnPool is then shared by your MongoDatabases.
val system = ActorSystem()
val nodes = Seq("localhost")
val connPool = MongoConnPool(system, nodes)##Connecting to a Database
case class SampleModel(_id: String, data: String)
object SampleModel { implicit val handler = Macros.handler[SampleModel] }
case class MyMongoDB(conn: MongoConnPool) extends MongoDatabase {
val name: String = "db_name"
val MyCollection: MongoCollection = getCollection[SampleModel]("my-collection")
}##Using the DSL
import com.github.kfang.mongo4s.MongoDsl._
//connect to the database using the connection pool
val Database = MyMongoDB("my-db-name", connPool)
//execute a query on a collection
Database.MyCollection.execute(count("data" -> "data-value")).map(c => {
println("There are " + c + " document that match {'data':'data-value'}")
})
//find/read out documents
val getOne: Future[Option[SampleModel]] = Database.MyCollection.execute(find.id("id-to-find").one)
val getOne: Future[Option[SampleModel]] = Database.MyCollection.execute(find.sel("_id" -> "id-to-find").one)
val getList: Future[List[SampleModel]] = Database.MyCollection.execute(find.sel().limit(20).asList)
//insert/create a document
val model = SampleModel("some-id", "my-data")
Database.MyCollection.execute(insert.model(model))
Database.MyCollection.execute(insert.doc(BSONDocument("_id" -> "some-id", "data" -> "my-data")))
//remove/delete a document
val model = SampleModel("some-id", "my-data")
Database.MyCollection.execute(remove.model(model))
Database.MyCollection.execute(remove.id(model.id))
Database.MyCollection.execute(remove.sel("_id" -> model.id))
//TODO: update a document
//TODO: distinct values##Shorcuts!! I find the whole BSONDocument("field" -> BSONDocument("field" -> BSONDocument("field" -> "value"))) thing a little long to type out. So... here you go!
import com.github.kfang.mongo4s.MongoShortcuts._
//you could do this...
BSONDocument("field" -> BSONDocument("field" -> BSONDocument("field" -> "value")))
//or this!
Bdoc("field" -> BDoc("field" -> BDoc("field" -> "value")))
//$inc
BSONDocument("$inc" -> BSONDocument("field" -> 1))
Bdoc($inc("field" -> 1))
//$currentDate
BSONDocument("$currentDate" -> BSONDocument("field" -> BSONDocument("$type" -> "date")))
Bdoc($currentDate("field"))
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