Query to $unwind $group and $match with mongo db - database

Question

I am trying to find solution to this query, I am using $group, $match.
This would be the collection:
PlayerTournament: [
{
"_id": 1,
"Name": "John Aims",
"Gender": "M",
"DoB": ISODate("1990-01-01T00:00:00Z"),
"Nationality": "USA",
"Hand": "R",
"YearTurnedPro": 2010,
"Tournament": [
{
"TournamentYear": 2016,
"TournamentCode": "GS1",
"Position": 8,
"PrizeMoney": 125000,
"RankingPoints": 250
},
{
"TournamentYear": 2019,
"TournamentCode": "GS4",
"Position": 2,
"PrizeMoney": 625000,
"RankingPoints": 1000
},
{
"TournamentYear": 2021,
"TournamentCode": "GS3",
"Position": 4,
"PrizeMoney": 312500,
"RankingPoints": 500
}
]
},
{
"_id": 2,
"Name": "George Brown",
"Gender": "M",
"DoB": ISODate("1997-03-04T00:00:00Z"),
"Nationality": "GB",
"Hand": "L",
"YearTurnedPro": 2013,
"Tournament": [
{
"TournamentYear": 2016,
"TournamentCode": "GS1",
"Position": 4,
"PrizeMoney": 250000,
"RankingPoints": 500
},
{
"TournamentYear": 2019,
"TournamentCode": "GS3",
"Position": 2,
"PrizeMoney": 625000,
"RankingPoints": 1000
}
]
},
{
"_id": 3,
"Name": "Kate Upson",
"Gender": "F",
"DoB": ISODate("1999-12-07T00:00:00Z"),
"Nationality": "GB",
"Hand": "L",
"YearTurnedPro": 2013,
"Tournament": [
{
"TournamentYear": 2016,
"TournamentCode": "GS1",
"Position": 1,
"PrizeMoney": 1000000,
"RankingPoints": 2000
},
{
"TournamentYear": 2019,
"TournamentCode": "GS1",
"Position": 4,
"PrizeMoney": 250000,
"RankingPoints": 500
},
{
"TournamentYear": 2020,
"TournamentCode": "GS4",
"Position": 2,
"PrizeMoney": 625000,
"RankingPoints": 1000
},
{
"TournamentYear": 2017,
"TournamentCode": "GS2",
"Position": 2,
"PrizeMoney": 625000,
"RankingPoints": 1000
}
]
},
{
"_id": 4,
"Name": "Mary Bones",
"Gender": "F",
"DoB": ISODate("1998-10-04T00:00:00Z"),
"Nationality": "AUSTRALIA",
"Hand": "L",
"YearTurnedPro": 2015,
"Tournament": [
{
"TournamentYear": 2018,
"TournamentCode": "GS3",
"Position": 1,
"PrizeMoney": 1250000,
"RankingPoints": 2000
},
{
"TournamentYear": 2019,
"TournamentCode": "GS2",
"Position": 2,
"PrizeMoney": 625000,
"RankingPoints": 1000
}
]
},
{
"_id": 5,
"Name": "Yuri Roza",
"Gender": "M",
"DoB": ISODate("2000-05-11T00:00:00Z"),
"Nationality": "BELARUS",
"Hand": "R",
"YearTurnedPro": 2018,
"Tournament": [
{
"TournamentYear": 2020,
"TournamentCode": "GS4",
"Position": 4,
"PrizeMoney": 250000,
"RankingPoints": 500
},
{
"TournamentYear": 2018,
"TournamentCode": "GS2",
"Position": 4,
"PrizeMoney": 312500,
"RankingPoints": 500
}
]
}
]
This is what I tried.
db.PlayerTournament.aggregate([
{
"$unwind": "$Tournament"
},
{
$match: {
"Tournament.TournamentYear": {
$gte: 2020
}
}
},
{
"$group": {
"_id": {
Name: "$Name"
},
"total_qty": {
"$sum": "$Tournament.PrizeMoney"
}
}
}
])
I am getting all the player that have won something after the year 2020.
I am looking to select the players' name of those that won more than 500000(prizemoney) after the year 2020.

Answer 1

You need one more $match stage to filter grouped results:
db.collection.aggregate([
{
"$unwind": "$Tournament"
},
{
$match: {
"Tournament.TournamentYear": {
$gte: 2020
}
}
},
{
"$group": {
"_id": {
Name: "$Name"
},
"total_qty": {
"$sum": "$Tournament.PrizeMoney"
}
}
},
{
"$match": { "total_qty": { "$gte": 500000 } }
}
])
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