Aggregate is not a function - mongodb/meteor

Question

I have this collection (Spieltag) with two documents in MongoDB:

0: Object Note:2.5 SaisonID:201516 SpielerID:105 SpieltagID:1 Tore:1 _id:"vkD5sMCdZdntoCFGP"

1: Object Note:3 SaisonsID:201516 SpielerID:105 SpieltagID:1 Tore:0 _id:"PrqokMS47K4vx4KR4"

I want to summarize Note (2.5+1) with a "where clause" on SpielerID.

This is what I have tried to use:

Spieltag.aggregate({ $match: {
        { SpielerID: { $gte: 105 } }
} },
{ $group: { _id : null, sum : { $sum: "$Note" } } });

But it doesn't work, throwing Aggregate is not a function. Any idea what's wrong?

Possible duplicate of how to use aggregate function in meteor — Mario Trucco
– Mario Trucco, Commented Feb 17, 2017 at 22:47

Pablo Larvor · Accepted Answer · 2017-02-18 21:58:23Z

3

First, you need to add the aggregate package for Meteor :

meteor add meteorhacks:aggregate

Second, you must pass an array parameter in aggregate like :

Spieltag.aggregate([{
  $match: {
    SpielerID: { $gte: 105 },
  },
}, {
  $group: {
    _id: null,
    sum: { $sum: '$Note' },
  },
}]);

answered Feb 18, 2017 at 21:58

Pablo Larvor

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3 Comments

HansMuff Over a year ago

I made an update... meteorhacks:aggregate added, version 1.3.0 meteorhacks:collection-utils added, version 1.2.0 mongo-livedata added, version 1.0.9 And I insert the above aggregation function to the java script console in chrome. But i get the same error. Must I insert a statement into my app that this will work?

Pablo Larvor Over a year ago

I'm sorry, as mentionned in github.com/meteorhacks/meteor-aggregate, aggregate only works on the server side. To use it on the client you can publish the result of the aggregate function from the server and subscribe to it in the client.

HansMuff Over a year ago

What I have to do when you say that I must build the aggregate function on the server side? In my js File I have the following structure... if (Meteor.isClient) { ... } if(Meteor.isServer) { ... } At the moment in the Server is only Meteor.startup(function () { }); and the anything else is in the isClient "area"

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