Se ho capito il tuo problema, ecco una soluzione usando $group :
db.sensingresults.aggregate([
{
"$lookup": {
"from": "accounts",
"localField": "accountId",
"foreignField": "_id",
"as": "accountInfo"
}
},
{
"$unwind": "$accountInfo"
},
{
$addFields: {
"dateHour": {
"$dateToString": {
"format": "%Y-%m-%dT%H",
"date": "$updatedAt"
}
},
"minuteBucket": {
"$trunc": {
"$divide": [
{
"$minute": "$updatedAt"
},
15.0
]
}
},
"device": {
"$let": {
"vars": {
"building": {
"$arrayElemAt": [
{
"$filter": {
"input": "$accountInfo.buildings",
"cond": {
"$eq": [
"$$this._id",
"$buildingId"
]
}
}
},
0
]
}
},
"in": {
"$let": {
"vars": {
"gateway": {
"$arrayElemAt": [
{
"$filter": {
"input": "$$building.gateways",
"cond": {
"$eq": [
"$$this._id",
"$gatewayId"
]
}
}
},
0
]
}
},
"in": {
"$arrayElemAt": [
{
"$filter": {
"input": "$$gateway.devices",
"cond": {
"$eq": [
"$$this._id",
"$deviceId"
]
}
}
},
0
]
}
}
}
}
}
}
},
{
$group: {
_id: {
area: "$device.area",
applicationNumber: "$device.applicationNumber",
accountId: "$accountId",
dateHour: "$dateHour",
minuteBucket: "$minuteBucket",
buildingId: "$buildingId"
},
avgZoneCountNumberInstant: {
$avg: "$zoneCountNumberInstant"
},
avgZoneCountNumber: {
$avg: "$zoneCountNumber"
},
total: {
$sum: 1
},
"spaceType": {
"$first": "$device.spaceType"
},
presences: {
$sum: "$presenceStatus"
}
}
},
{
$addFields: {
occupancyRate: {
$concat: [
{
$toString: {
$multiply: [
100,
{
$divide: [
"$presences",
"$total"
]
}
]
}
},
"%"
]
}
}
}
])
Il risultato sarà
[
{
"_id": {
"accountId": ObjectId("5e1fe45cd05bfb0cc549297d"),
"applicationNumber": 30,
"area": "area2",
"buildingId": ObjectId("5e1fe5e3d05bfb0cc5494146"),
"dateHour": "2020-03-19T18",
"minuteBucket": 1
},
"avgZoneCountNumber": 0,
"avgZoneCountNumberInstant": 0,
"occupancyRate": "0%",
"presences": 0,
"spaceType": null,
"total": 1
},
{
"_id": {
"accountId": ObjectId("5e1fe45cd05bfb0cc549297d"),
"buildingId": ObjectId("5e1fe5e3d05bfb0cc5494146"),
"dateHour": "2020-03-19T18",
"minuteBucket": 1
},
"avgZoneCountNumber": 0,
"avgZoneCountNumberInstant": 0,
"occupancyRate": "0%",
"presences": 0,
"spaceType": null,
"total": 2
},
{
"_id": {
"accountId": ObjectId("5e1fe45cd05bfb0cc549297d"),
"buildingId": ObjectId("5e1fe5e3d05bfb0cc5494146"),
"dateHour": "2020-03-20T18",
"minuteBucket": 1
},
"avgZoneCountNumber": 0.5,
"avgZoneCountNumberInstant": 0,
"occupancyRate": "100%",
"presences": 2,
"spaceType": null,
"total": 2
}
]
