MongoDBUtils.scala

object MongoDBUtils {
  private def getAsRec[T: Manifest](dbo: MongoDBObject, keys: List[String]): Option[T] = keys match {
    case Nil => None
    case key :: Nil => dbo.getAs[T](key)
    case key :: rest => dbo.getAs[DBObject](key).flatMap(doc => getAsRec[T](doc, rest))
  }

  def getAs[T:Manifest](dbo: MongoDBObject, key: String): Option[T] = getAsRec[T](dbo, key.split('.').toList)
}