问Jongo如何连接集合

EN

public Class Team{
   @Id
   String id;
   String name = "";
}

public Class Player{
  @Id
  String id;
  String team_id = "";
  String name = "";
}

Iterator<Player> plist = Player.findAllIter();
while (plist.hasNext()) {
  Player p = plist.next();
  Team t = p.getTeam();
}

public static Iterator<Player> findAllIter() {
  return players().find().as(Player.class).iterator();
}

public Team getTeam() {
  Team t = Team.findById(this.team_id);
  return t == null ? new Team() : t;
}