Meteor 流星黑客：聚合错误

我正在尝试使用meteorhacks:aggregate发布一些数据：

Meteor.publish('alleNascholingen',function() {
var self = this;

var nascholingenOverzicht = nascholingenCollectie.aggregate([
   //{$match: {creatorId: this.userId}},
   //{$project: {naam: 1, familienaam:1, nascholingen:1}},
   { $unwind : "$nascholingen" },
   { $sort: {
       "nascholingen.inschrijfMoment": -1
   }}
   ]);

_.each(nascholingenOverzicht, function(parent){
    _.each(parent, function(child){
        self.added('selectie', child._id, child);
    });
});


 self.ready()
});

我有两个集合，一个用于存储聚合数据：

nascholingenCollectie = new Mongo.Collection('nascholingen');
nascholingenSelectie = new Mongo.Collection('selectie');

在我的模板上，我订阅了以下数据：

Template.nascholingBeheer.onCreated(function() {
let self = Template.instance();

    self.subscribe('alleNascholingen', function () {
        setTimeout(function () {

        }, 300)
    })

})
});

我的chrome控制台中出现以下错误：

collection.js:173 Uncaught Error: Expected to find a document to change
at Object.update (http://localhost:3000/packages/mongo.js?hash=c4281c0ff989ebee020f59f5a7b0735053cea5f7:246:29)
at Object.store.(anonymous function) [as update] (http://localhost:3000/packages/ddp-client.js?hash=bc32a166cd269e06a394f9418e0024d805bab379:3613:48)
at http://localhost:3000/packages/ddp-client.js?hash=bc32a166cd269e06a394f9418e0024d805bab379:4441:19
at Array.forEach (native)
at Function._.each._.forEach (http://localhost:3000/packages/underscore.js?hash=cde485f60699ff9aced3305f70189e39c665183c:149:11)
at http://localhost:3000/packages/ddp-client.js?hash=bc32a166cd269e06a394f9418e0024d805bab379:4440:13
at Function._.each._.forEach (http://localhost:3000/packages/underscore.js?hash=cde485f60699ff9aced3305f70189e39c665183c:157:22)
at Connection._performWrites (http://localhost:3000/packages/ddp-client.js?hash=bc32a166cd269e06a394f9418e0024d805bab379:4437:9)
at Connection._flushBufferedWrites (http://localhost:3000/packages/ddp-client.js?hash=bc32a166cd269e06a394f9418e0024d805bab379:4423:10)
at Connection._livedata_data (http://localhost:3000/packages/ddp-client.js?hash=bc32a166cd269e06a394f9418e0024d805bab379:4391:12)

---

我做错了什么？

您不能在Meteor出版物中使用聚合，只能在Meteor方法中使用聚合。为了解决这个问题，你可以考虑使用这个（免责声明：我是作者）。

< P>我的坏…我发现我的错误：

_.each(nascholingenOverzicht, function(parent){
_.each(parent, function(child){
    self.added('selectie', child._id, child);
});
});

应该是：

_.each(nascholingenOverzicht, function(parent){

    self.added('selectie', parent._id, parent);

});

---

嗯，奇怪的是，它以前是这样工作的……但不知怎么的，我把我的文件复制到了一个新文件夹，突然出现了这个错误。我用向导来做这件事。