How to find all voted user against each debate in mongoose - node.js

Question

I have a debate collection, which holds all the debates and another collection holds the votes against each debate. So I wanted to retrieve all the debates with a new user flag (isVoted) if I found any user in the vote collection against each debate.
Vote model:
var voteSchema = new Schema({
user: { type: Schema.Types.ObjectId, required: true, ref: 'User' }, // One who votes
debate: { type: Schema.Types.ObjectId, required: true, ref: 'Debate' }
}, { timestamps: true });
Debate Model:
var debateSchema = new Schema({
category: { type: Schema.Types.ObjectId, required: true, ref: 'Category' },
question: { type: String, required: true },
Votes: { type: Number, default: 0 },
}, { timestamps: true });
Query
DebateData.aggregate([
{
$match: query
},
{
$sort : { createdAt : -1 }
},
{
$lookup: {
from: "votes", // must be the PHYSICAL name of the collection
localField: "_id",
foreignField: "debate",
as: "votes"
}
},
{
$addFields: {
'isVoted': {
$cond: { if: { $eq: [ '$votes.user', ObjectId(req.query.userId) ] }, then: 'true', else: 'false' }
}
}
},
{
$project: {
'_id': 1,
'question': 1,
'isVoted': 1,
'createdAt': 1
}
},
]).then(result => {
res.status(200).json({ success: true, status: 200, message: 'Debate videos', data: result});
}).catch(err => {
res.status(500).json({ success: false, status: 500, message: err.message })
});
Expected output:
{
"data": [
{
"_id": "60e81f8299a4809658290d80",
"votes": 10,
"category": [
{
"name": "Hockey"
}
],
"question": "What is football?",
"isVoted": true,
"createdAt": "2021-07-09T10:05:54.498Z"
},
{
"_id": "60e438f1194949add0cc2074",
"votes": 12,
"category": [
{
"name": "Cricket"
}
],
"question": "What is football?",
"isVoted": false,
"createdAt": "2021-07-06T11:05:21.654Z"
}
]
}
Current output:
{
"data": [
{
"_id": "60e81f8299a4809658290d80",
"votes": 10,
"category": [
{
"name": "Hockey"
}
],
"question": "What is football?",
"createdAt": "2021-07-09T10:05:54.498Z"
},
{
"_id": "60e438f1194949add0cc2074",
"votes": 12,
"category": [
{
"name": "Cricket"
}
],
"question": "What is football?",
"createdAt": "2021-07-06T11:05:21.654Z"
}
]
}
Vote Data:
{
data: [
{
"user": "69881f8299a480965829ytr267",
"debate": "60e81f8299a4809658290d80"
}
]
}