JavaScript mongodb to return object from facet mongodb return object instead of array,mongodb return object,mongodb

Is it possible to have facet to return as an object instead of an array? It seems a bit counter intuitive to need to access result[0].total instead of just result.total

code (using mongoose):

        Model
            .aggregate()
            .match({
                "name": { "$regex": name },
                "user_id": ObjectId(req.session.user.id),
                "_id": { "$nin": except }
            })
            .facet({
                "results": [
                    { "$skip": start },
                    { "$limit": finish },
                    {
                        "$project": {
                            "map_levels": 0,
                            "template": 0
                        }
                    }
                ],
                "total": [
                    { "$count": "total" },
                ]
            })
            .exec()

Answer:1

Each field you get using $facet represents separate aggregation pipeline and that's why you always get an array. You can use $addFields to overwrite existing total with single element. To get that first item you can use $arrayElemAt

Model
    .aggregate()
    .match({
        "name": { "$regex": name },
        "user_id": ObjectId(req.session.user.id),
        "_id": { "$nin": except }
    })
    .facet({
        "results": [
            { "$skip": start },
            { "$limit": finish },
            {
                "$project": {
                    "map_levels": 0,
                    "template": 0
                }
            }
        ],
        "total": [
            { "$count": "total" },
        ]
    })
    .addFields({
        "total": {
            $arrayElemAt: [ "$total", 0 ]
        }
    })
    .exec()

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