node.js – Mongoose复杂(异步)虚拟

var playerscheR_250_11845@a = new mongoose.scheR_250_11845@a({
    name: String,team_id: mongoose.scheR_250_11845@a.Types.ObjectId
});
Players = mongoose.model('Players',playerscheR_250_11845@a);

var teamscheR_250_11845@a = new mongoose.scheR_250_11845@a({
    name: String
});
Teams = mongoose.model('Teams',teamscheR_250_11845@a);

当我查询团队时,我也会得到虚拟生成的小队：

Teams.find({},function(err,teams) {
  JSON.Stringify(teams); /* => [{
      name: 'team-1',squad: [{ name: 'player-1' },...]
    },...] */
});

但我无法使用虚拟机获得此功能,因为我需要异步调用：

teamscheR_250_11845@a.virtual('squad').get(function() {
  Players.find({ team_id: this._id },players) {
    return players;
  });
}); // => undefined

实现这一结果的最佳方法是什么？

谢谢！