Group by and Get Max Value MongoDb - mongodb

Question

I would like to get the highest number of counts for each numId and display it on my front end in a table.
Here is an example of my database:
{
"_id": {
"$oid": "6294777f677b4c647e28771a"
},
"numId": "5",
"respondee": "0x9d95bcaa5b609fa97a7ec860bec115aa94f85ba9",
"__v": 0,
"originalResponse": "test2",
"submittedAt": {
"$date": {
"$numberLong": "1653897087357"
}
},
"addresses": [
"0x39c878a3df98002ddba477a7aa0609fb5a27e2ff",
"0xe3342d6522ad72f65d6b23f19b17e3fb12161f90"
],
"count": 2
},
{
"_id": {
"$oid": "6294836e677b4c647e287e93"
},
"numId": "5",
"respondee": "0xe3342d6522ad72f65d6b23f19b17e3fb12161f90",
"__v": 0,
"originalResponse": "test3",
"submittedAt": {
"$date": {
"$numberLong": "1653900142375"
}
},
"addresses": [
],
"count": 0
}
I have written something like this but I'm not sure how to group the results according to the numId
import Response from '../../../models/Response.model';
import db from '../../../utils/config/db';
import nc from 'next-connect';
import { onError } from '../../../utils/error';
const handler = nc({
onError,
});
//GET all
handler.get(async (req, res) => {
await db.connect();
let responses = await Response.find({ });
//To group responses by numId
// Sort responses by votes in ascending order
responses = responses.sort((a, b) => {
return a.count - b.count;
});
let topResponses = responses.filter((response) => {
return response.count === responses[0].count;
});
// Check if respondee has the highest count response
if (
topResponses.length > 0 &&
topResponses.find((response) => {
return response.respondee === respondee;
})
) {
// Get the response
let response = topResponses.find((response) => {
return response.respondee === respondee;
});
// Get the response
let responseString = response.response;
// Get the count
let count = response.count;
}
await db.disconnect();
});
export default handler;

Answer 1

I have figured out the answer by referring from another stackoverflow:
Group by and Get Max Value MongoDb
let responses = await Response.aggregate([
{ $sort: { votes: -1 } },
{ $group: { _id: '$baseId', group: { $first: '$$ROOT' } } },
{ $replaceRoot: { newRoot: '$group' } },
]);
res.send(responses);