Salat nested case class with scala 2.9.1

TestNesting.scala

import com.mongodb.casbah._
import com.novus.salat.grater
import com.novus.salat.annotations._
import com.novus.salat.global._
import com.mongodb.casbah.Implicits._

case class Child(value: String)
case class Parent(@Key("_id") id: String, nested: Child)

object TestNesting {
  def main(args: Array[String]) {
    val db  = MongoConnection()("childtest")
    val coll = db("testColl")
    coll.drop

    val child = Child("C")
    val parent = Parent("testId", child)

    // A conversion straight back to Parent will work here as the DBObject has
    // the Child, not a DBObject of the child 
    println(grater[Parent].asDBObject(parent))

    // On save, the Child class gets flattened to a DBList because
    // it implements Product
    coll.save(grater[Parent].asDBObject(parent))

    coll.findOneByID("testId") map { result =>
      // This row will cause an error as it expects type "Child" and receives
      // A db list [ "C" ]
      println(grater[Parent].asObject(result))
    }
  }
}