Get Total Count using aggregate + facet using Mongo - node.js

Question

I want to group my data based on event date with pagination. However what i am getting is whole record totalcount instead of eventDate count. because of this UI part is not working properly. Here is my collection sample:
{
"_id" : ObjectId("5fc4d0009a25e8cfbe306381"),
"eventDate" : ISODate("2021-11-29T01:00:00.000Z"),
"team1" : {
"tName" : "Chicago Bears",
},
"team2" : {
"tName" : "Green Bay Packers",
}
}
{
"_id" : ObjectId("5fc4d0019a25e8cfbe3063ff"),
"eventDate" : ISODate("2021-11-30T01:00:00.000Z"),
"team1" : {
"tName" : "Nashville SC",
},
"team2" : {
"tName" : "Columbus Crew",
}
}
{
"_id" : ObjectId("5fc4d0019a25e8cfbe3063f4"),
"eventDate" : ISODate("2021-11-30T01:00:00.000Z"),
"team1" : {
"tName" : "yyyy",
},
"team2" : {
"tName" : "xxxx",
}
}
here is my query:
db.getCollection('game').aggregate([
{ $addFields: { "newEventDate": {$dateToString:{ format: "%Y-%m-%d", date: "$eventDate" }}}},
{ "$match": {
"eventDate": { $gte: new Date() }
}
},
{ "$facet": {
"resultData": [
{ "$match": {
"eventDate": { $gte: new Date() }
}
},
{ "$group": {
"_id": "$newEventDate",
"games": {$push: {
team1:"$team1",
team2:"$team2"
}}
}
},
{ $sort: {eventDate: 1} },
{
$limit: 1
}
],
"pageInfo": [
{ "$count": "totalRecords" }
]}
}
]);
After executing this query this is my response:
{
"resultData" : [
{
"_id" : "2021-11-29",
"games" : [
{
"awayTeam" : {
"tName" : "Chicago Bears"
},
"homeTeam" : {
"tName" : "Green Bay Packers"
}
},
]
}
],
"pageInfo" : [
{
"totalRecords" : 3 **[here i want 2 ie total event date]**
}
]
}

Answer 1

$match your condition
move your $group stage outside from $facet, convert your date from string inside group, add you date in group stage because we are going to sort in next stage
$sort by eventDate ascending order
$facet, first get single record using $limit, and second part get total count of the record using $count
db.collection.aggregate([
{ $match: { eventDate: { $gte: new Date() } } },
{
$group: {
_id: {
$dateToString: {
format: "%Y-%m-%d",
date: "$eventDate"
}
},
eventDate: { $first: "$eventDate" },
games: {
$push: {
team1: "$team1",
team2: "$team2"
}
}
}
},
{ $sort: { eventDate: 1 } },
{
$facet: {
resultData: [{ $limit: 1 }],
pageInfo: [{ $count: "totalRecords" }]
}
}
])
Playground