Testing Mongo's $elemMatch DSL with the Casbah API

TestElemMatch.scala

package test

import com.mongodb.casbah.Imports._
import com.mongodb.util.JSON
import com.typesafe.config.ConfigFactory
import org.scalatest._
import org.scalatest.matchers.ShouldMatchers
import play.api.libs.json._
import play.api.{Play, Logger}

class TestElemMatch extends FlatSpec with ShouldMatchers {
  "Testing $elemMatch" should "return results" { 

    val collection = MongoConnection()("test")("test")

  	val obj: JsValue = Json.parse("""records : [{n : "Name", v: "Will"}]""")
	val doc: DBObject = JSON.parse(obj.toString).asInstanceOf[DBObject]

	collection.insert(doc)

	val elemMatch = "records" $elemMatch (MongoDBObject("n" -> "Name", "v" -> "Will"))

	var builder = MongoDBObject()

	builder = builder ++ elemMatch

	collection.find(builder)
  }
}
 

[playApp] $ test-only test.TestElemMatch
[info] Compiling 2 Scala sources
[error] TestElemMatch.scala:27: type mismatch
[error] found : collection.CursorType
[error](which expands to) com.mongodb.casbah.MongoCursor
[error] required: Int
[error] collection.find(builder)
[error] ^
[error] one error found
error Compilation failed
[error] Total time: 1 s, completed Oct 3, 2013 5:21:25 PM