猫鼬复杂（异步）虚函数 [英] Mongoose complex (async) virtuals

问题描述

我有两个猫鼬架构如下：

var playerSchema = new mongoose.Schema({
    name: String,
    team_id: mongoose.Schema.Types.ObjectId
});
Players = mongoose.model('Players', playerSchema);

var teamSchema = new mongoose.Schema({
    name: String
});
Teams = mongoose.model('Teams', teamSchema);

当我询问我的团队也将获得虚拟生成的阵容

When I query Teams I would to get also the virtual generated squad:

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

但我的不能得到这个使用虚函数后，因为我需要一个异步电话：

but I can't get this using virtuals, because I need an async call:

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

什么是实现这一结果的最佳方式？

What is the best way to achieve this result?

谢谢！

推荐答案

这是可能是最好的作为的实例方法你加入 teamSchema ，以便调用者可以提供一个回调来接收异步结果是：

This is probably best handled as an instance method you add to teamSchema so that the caller can provide a callback to receive the async result:

teamSchema.methods.getSquad = function(callback) {
  Players.find({ team_id: this._id }, callback);
});

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