Limit results in a Mongo Aggregation

Asked Apr 13 '16 at 19:58

Active Apr 13 '16 at 20:09

Viewed 24 times

I have a collection of users and in each document there is an array of objects.

I want to group all these objects together BUT only want to return 5 results at a time. I tried to use {$limit: 5} but it doesn't seem to return just 5 objects.

This is my code:

var res = Meteor.users.aggregate([
     {$unwind : "$docUploaded"},
     {$group:{_id: null, val:{$push:'$docUploaded'}}}, 
     {$limit:5}] );
console.log(res);

How can I just limit it to 5 objects rather than all objects that are currently returned?

edited Apr 13 '16 at 20:02

profesor79

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asked Apr 13 '16 at 19:58

user94628

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Do you want to limit to 5 groups with all the group's documents, or to get all the groups but with only 5 documents per group? – DevLounge Apr 13 '16 at 20:06
To 5 documents per group – user94628 Apr 13 '16 at 20:08
1

then, your answer is here: http://stackoverflow.com/questions/24463689/mongodb-aggregation-group-restrict-length-of-array – DevLounge Apr 13 '16 at 20:09
this one might help too: http://stackoverflow.com/questions/24594049/mongodb-aggregation-pipeline-how-to-limit-a-group-push – DevLounge Apr 13 '16 at 20:13
1

The first link you gave worked, I had the `{$limit:5}` after the `$group`, hence it not do the limit. Thanks – user94628 Apr 13 '16 at 20:15

Limit results in a Mongo Aggregation

0 Answers0