Mongoose query compare ObjectId - node.js

Question

I'm trying to fetch some documents from my db. In each document, there is a field called 'owner' which is an ObjectId of a user. I want to fetch all of the documents of a specific user. I have the user id and when I'm trying to do something like this:
exports.getBoxes = function(req, res) {
const { user } = res.locals;
const query = db.Box.find();
query.where('owner').equals(user._id);
query.exec(function(err, boxes) {
console.log(boxes);
});
}
I get an empty array. I saw in my db and there are many boxes that corresponds to this query. What's wrong with it?
UPDATE
Here is my schema:
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const timestamps = require('mongoose-timestamps');
const BoxSchema = new Schema({
description: {
type: String,
trim: true
},
producer: {
type: String,
trim: true
},
cycle: {
type: String,
trim: true
},
owner: {
type: Schema.ObjectId,
ref: 'Supplier'
},
event: {
type: Schema.ObjectId,
ref: 'Event'
},
type: {
type: String,
enum: []
},
creditTerms: {
type: String,
enum: ['Cash', '30 Days', '60 Days', '90 Days', '120 Days']
},
bids: [{
type: Schema.ObjectId,
ref: 'Bid'
}],
looking: [{
type: Schema.ObjectId,
ref: 'User'
}],
sold: Boolean,
paid: Boolean,
delivered: Boolean,
sealed: Boolean,
initialPrice: Number,
value: Number,
cts: Number,
ppc: Number,
finalPrice: Number
});
BoxSchema.plugin(timestamps);
module.exports = mongoose.model('Box', BoxSchema);
And here is an example of documents that I try to fetch:
https://i.gyazo.com/38f2d16d6831b831adb3cc448ef74d01.png

Answer 1

Okay guys I managed to solve this problem. The problem was that the owner field in the box schema referenced a Supplier object, not a User object. So I solved it like so:
const { user } = res.locals;
return db.Supplier.findOne({ userId: user._id })
.populate('boxes').exec(function(err, supplier) {
if(err || !supplier) return res.sendStatus(404);
res.json(supplier.boxes);
});