MongoDB aggregate data using $agg - mongodb

Question

So i try to aggregate the data from mongoDB using $match and $group to get the exact value an d format with data from mongoDB in JSON as Below:
[ {
_id: new ObjectId("6357b4237cf79bba3e66c096"),
userId: new ObjectId("635762fe85b94eac7466d965"),
formId: new ObjectId("6357921d49de88bb7fffcfe4"),
title: 'Quality',
username: 'Jansenstan24#gmail.coms',
date: '2022-10-25',
answer: {
'6357921d49de88bb7fffcfe8': 'john#nabatisnack.com',
Text: 'john#nabatisnack.com',
'6357b331235053a9d4e8d037': 'john#dose.com',
Email: 'john#dose.com',
'6357b335235053a9d4e8d03a': 'Maja',
Plant: 'Maja'
},
createdAt: 1666692131,
updatedAt: 1666692131,
__v: 0
},
{
_id: new ObjectId("6357b54922866fae378af370"),
userId: new ObjectId("635762fe85b94eac7466d965"),
formId: new ObjectId("6357921d49de88bb7fffcfe4"),
title: 'Quality',
username: 'Jansenstan24#gmail.coms',
date: '2022-10-25',
answer: {
'6357921d49de88bb7fffcfe8': 'john#dose.com',
Text: 'john#dose.com',
'6357b331235053a9d4e8d037': 'john#nabatisnack.com',
Email: 'john#nabatisnack.com',
'6357b335235053a9d4e8d03a': 'Cica',
Plant: 'Cica'
},
createdAt: 1666692425,
updatedAt: 1666692425,
__v: 0
},
{
_id: new ObjectId("6357b6a2a13ab3c4a462be8f"),
userId: new ObjectId("635647c1e24d0a4482e3c0a9"),
formId: new ObjectId("6357921d49de88bb7fffcfe4"),
title: 'Quality',
username: 'adam#wegodev.com',
date: '2022-10-25',
answer: {
'6357921d49de88bb7fffcfe8': '12',
Text: '12',
'6357b331235053a9d4e8d037': 'john#dose.coms',
Email: 'john#dose.coms',
'6357b335235053a9d4e8d03a': 'Ranca',
Plant: 'Ranca'
},
createdAt: 1666692770,
updatedAt: 1666692770,
__v: 0
}]
using this line of code in javascript:
forms = await Answer.aggregate([
{
$match: { title: "Quality" },
},
{ $group: { title: "Quality"} },
]);
what i expected is the result like this:
{
formId: new ObjectId("6357921d49de88bb7fffcfe4"),
title: 'Quality',
username: [{'Jansenstan24#gmail.coms',adam#wegodev.com}]
date: [{'2022-10-25','2022-10-26}]
answer: [{
'6357921d49de88bb7fffcfe8': 'john#nabatisnack.com',
Text: 'john#nabatisnack.com',
'6357b331235053a9d4e8d037': 'john#dose.com',
Email: 'john#dose.com',
'6357b335235053a9d4e8d03a': 'Maja',
Plant: 'Maja'
},{
'6357921d49de88bb7fffcfe8': 'john#dose.com',
Text: 'john#dose.com',
'6357b331235053a9d4e8d037': 'john#nabatisnack.com',
Email: 'john#nabatisnack.com',
'6357b335235053a9d4e8d03a': 'Cica',
Plant: 'Cica'
},...etc],
},
i try to use more complex query but it seems it not return the result i want and i've try to seek any related problem but it wont return the same result as i want

Answer 1

You have the right idea using $group, you just need to leverage it's syntax properly, like so:
db.collection.aggregate([
{
$match: {
title: "Quality"
}
},
{
$group: {
_id: "$title",
title: {
$first: "$title"
},
username: {
"$addToSet": "$username"
},
date: {
$addToSet: "$date"
},
formId: {
$addToSet: "$formId"
},
answer: {
$push: "$answer"
}
}
}
])
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