MongoDB findAndModify

findAndModify.scala

// Sane implementation of findAndModify:
findAndModify(update: Record => Record, new: Record) {
  getOld match {
    case None => save(new)
    case Some(oldRecord) => save(update(oldRecord))
  }
}

// MongodDb implementation of findAndModify:
findAndModify(update: Record => Record, new: Record, always: Record) { 
  getOld match {
    case None =>
      val emptyRecord = {}
      val emptyUpdated = update(emptyRecord)
      save(merge(emptyUpdate, new, always))
    case Some(oldRecord) =>
      val updated = ifExists(oldRecord)
      save(merge(updated, always))
  }
}