Exclude user in match MongoDB - mongodb

Question

I want to add Not in query. but unfortunately I'm not getting the required result. i want to get result where user is not equal to userid. But I'm confused as to how I can add that. I tried multiple scenarios but failed.
server.get('/myFeedback', (req, res) => {
var userid = req.query.userID;
//console.log(req.query);
db.collection("tweetsWithSentimentFeedback").aggregate( [
{
$group: {
_id: {
topic: "$topic",
group : "$group",
type : "$type",
user : "$userName"
},
count: { $sum: 1 }
}
},{ $group: {
_id: {
topic: "$_id.topic",
group : "$_id.group",
},
typeAndCount: {
$addToSet: {
type: "$_id.type",
count: "$count"
}
},
userName: {
$addToSet: {
user: "$_id.userName"
}
},
totalCount: {
$sum: "$count"
}
}
},
{ $match: { $and: [ { totalCount: { $gt: 0, $lt: 15 } }, {userEqual: { $ne: [ "$userName.user", userid ] }} ] } },
// Then sort
{ "$sort": { "totalCount": -1 } }
], (err, result) => {
if (err) {
console.log(err);
}
res.status(200).send(result);
} );
});

Answer 1

You should add a $match as a first stage to filter the user.
{ $match: { userName: { $ne: userid } } }
Update:
db.collection("tweetsWithSentimentFeedback").aggregate(
[{
$group: {
_id: {
topic: "$topic",
group: "$group",
type: "$type",
user: "$userName"
},
count: {
$sum: 1
}
}
}, {
$group: {
_id: {
topic: "$_id.topic",
group: "$_id.group"
},
typeAndCount: {
$addToSet: {
type: "$_id.type",
count: "$count"
}
},
userName: {
$addToSet: "$_id.userName"
},
totalCount: {
$sum: "$count"
}
}
}, {
$match: {
{
totalCount: {
$gt: 0,
$lt: 15
}
},
{
userName: {
$ne: userid
}
}
}
}, , {
$sort: {
totalCount: -1
}
}])