Detalhes do usuari

{
    "_id" : "5c23536f807caa1bec00e79b",
    "UID" : "1",
    "name" : "A",
},
{
    "_id" : "5c23536f807caa1bec00e78b",
    "UID" : "2",
    "name" : "B",
},
{
"_id" : "5c23536f807caa1bec00e90",
"UID" : "3",
"name" : "C"
}

UserProducts

{
    "_id" : "5c23536f807caa1bec00e79c",
    "UPID" : "100",
    "UID" : "1",
    "status" : "A"
},
{
    "_id" : "5c23536f807caa1bec00e79c",
    "UPID" : "200",
    "UID" : "2",
    "status" : "A"
},
{
"_id" : "5c23536f807caa1bec00e52c",
"UPID" : "300",
"UID" : "3",
"status" : "A"
}

Grupos

{
    "_id" : "5bb20d7556db6915846da55f",
    "members" : {
        "regularStudent" : [
            "200" // UPID
        ],
    }
},
{
"_id" : "5bb20d7556db69158468878",
"members" : {
    "regularStudent" : {
        "0" : "100" // UPID
    }
}
}

Passo

Tenho que tirar UID deDetalhes do usuari verificar com UserProducts então pegueUPID a partir de UserProducts

Passo

nós temos que verificar issoUPID mapeado para Grupos coleção ou não?members.regularStudent estamos mapeadosUPID

Etapa

Suppose UPID não mapeado significa que quero imprimir o UPID de UserProducts

Tentei, mas não consegui concluir isso, por favor me ajude nisso.

Saída esperada:

["300"]

Nota: o resultado esperado é["300"] , Porque UserProducts tendo UPID100 & 200 mas Grupos coleção mapeada apenas100& 200.

My Code

var queryResult = db.UserDetails.aggregate(
{
$lookup: {
    from: "UserProducts",
    localField: "UID",
    foreignField: "UID",
    as: "userProduct"
    }
},
{ $unwind: "$userProduct" },
{ "$match": { "userProduct.status": "A" } },
{
    "$project": { "_id" : 0, "userProduct.UPID" : 1 }
},
{
    $group: {
        _id: null,
        userProductUPIDs: { $addToSet: "$userProduct.UPID" }
    }
});

let userProductUPIDs = queryResult.toArray()[0].userProductUPIDs;

db.Groups.aggregate([
    {
        $unwind: "$members.regularStudent"
    },
    {
        $group: {
            _id: null,
            UPIDs: { $addToSet: "$members.regularStudent" }
        }
    },
    {
        $project: {
            members: {
                $setDifference: [ userProductUPIDs , "$UPIDs" ]
            },
            _id : 0
        }
    }
])

My Output

 {
    "members" : [
        "300",
        "100"
    ]
}