get

def authenticateByUsername(username: String, password: String): Boolean = {
  val result: Option[Boolean] = for {
    user <- users.findOne(MongoDBObject(USERNAME -> username))
    pass <- user.getAs(PASSWORD)
  } yield BCrypt.checkpw(pass, password)

  result getOrElse false
}

def authenticateByUsername(username: String, password: String): Boolean =
  users.findOne(MongoDBObject(USERNAME -> username)).flatMap(
    _.getAs(PASSWORD)
  ).map(
    BCrypt.checkpw(_, password)
  ).getOrElse(false)