【发布时间】：2020-07-21 08:47:01
【问题描述】：
我有这样的收藏： 集合名称是 - 帐户。 它有子文档，例如帐户 > 建筑物 > 网关 > 设备。
{
"_id" : ObjectId("5e1fe45cd05bfb0cc549297d"),
"apiCallCount" : 0,
"email" : "info@data.com",
"password" : "dummy",
"userName" : "AAAAA",
"companyName" : "The AAAAAA",
"apiKey" : "5e1fe45cd05bfb0cc549297c",
"solutionType" : "VVVVVV",
"parentCompany" : "",
"buildings" : [
{
"_id" : ObjectId("5e1fe5e3d05bfb0cc5494146"),
"buildingName" : "xxxxxx",
"address" : "xxx",
"suite" : "101",
"floor" : "22",
"timeZone" : "us/eastern",
"gateways" : [
{
"_id" : ObjectId("5e1fe624d05bfb0cc549453a"),
"gatewayName" : "CC-GW-THF-001",
"gatewayKey" : "gk_5e1fe624d05bfb0cc549453a",
"suite" : "area1",
"devices" : [
{
"_id" : ObjectId("5e1fe751d05bfb0cc549578d"),
"serialNumber" : "129300000013",
"area" : "area1",
"connectionStatus" : 1,
"gatewayKey" : "gk_5e1fe624d05bfb0cc549453a",
"applicationNumber" : 30,
"firmwareVersion" : "1.0",
"needsAttention" : false,
"verificationCode" : "GAAS",
"createdAt" : ISODate("2020-01-16T04:32:17.899Z"),
"updatedAt" : ISODate("2020-01-16T08:53:54.460Z")
}
],
"createdAt" : ISODate("2020-01-16T04:27:16.678Z"),
"updatedAt" : ISODate("2020-01-16T08:53:54.460Z")
},
{
"_id" : ObjectId("5e1fe651d05bfb0cc54947f0"),
"gatewayName" : "AA-GW-THF-002",
"gatewayKey" : "gk_5e1fe651d05bfb0cc54947f0",
"suite" : "area2",
"devices" : [
{
"_id" : ObjectId("5e1fe7a9d05bfb0cc5495cdf"),
"serialNumber" : "129300000012",
"area" : "area2",
"connectionStatus" : 0,
"gatewayKey" : "gk_5e1fe651d05bfb0cc54947f0",
"applicationNumber" : 30,
"firmwareVersion" : "1.0",
"needsAttention" : false,
"verificationCode" : "VG3K",
"createdAt" : ISODate("2020-01-16T04:33:45.698Z"),
"updatedAt" : ISODate("2020-01-16T08:54:17.604Z")
}
],
"createdAt" : ISODate("2020-01-16T04:28:01.532Z"),
"updatedAt" : ISODate("2020-01-16T08:54:17.604Z")
},
],
"createdAt" : ISODate("2020-01-16T04:26:11.941Z"),
"updatedAt" : ISODate("2020-01-16T08:56:32.657Z")
}
],
"createdAt" : ISODate("2020-01-16T04:19:40.310Z"),
"updatedAt" : ISODate("2020-04-06T18:18:39.628Z"),
"__v" : 1,
}
我有 accountId、buildingId、gatewayId、deviceId。 我正在尝试使用 $lookup 运算符查找匹配的设备对象。
我想我必须先使用 buildingId 找到建筑物对象，然后使用 gatewayId 过滤该建筑物下的网关，然后使用我拥有的 deviceId 找到设备对象。
我基本上需要访问设备对象字段才能在最终输出中进行投影。
难以为使用查找运算符提出正确的管道。
到目前为止我有这个：
db.getCollection('test').aggregate([
{
$lookup: {
from: 'account',
let: {
accountId: "$accountId"
},
pipeline: [
{
"$match": {
"$expr": {
"$eq": ["$_id", "$$accountId"]
}
}
},
],
as: "accountDetails"
}
}, {
$unwind: "$accountDetails"
}, {
$lookup: {
from: 'account',
let: {
accountId: "$accountId",
buildingId: "$buildingId",
buildings: "$accountDetails"
},
pipeline: [
{
"$match": {
"$expr": {
"$eq": ["$buildings._id", "$$buildingId"] // how to dig through nested document to get to devices ?
}
}
},
],
as: "buildingDetails"
}
}
{
$project: { ... ...
}
])
如果我这样做：
{
$lookup: {
from: 'account',
localField: "accountId",
foreignField: "_id",
as: "accountDetails"
}
},
accountDetails 让我可以根据 accountId 访问帐户文档。但我需要到达建筑物 > 网关 > 设备并找到匹配的设备。
更新：
我忘了提，我在这里处理 2 个系列。 感测结果和账目。
主要目的是从sensingresults中聚合数据，同时也从account collection中找到deviceId并返回结果。
这就是为什么需要查找来加入 2 个集合的原因？
更新2：
当前输出：
{
"accountId": ObjectId("5e1fe45cd05bfb0cc549297d"),
"avgZoneCountNumber": 0,
"avgZoneCountNumberInstant": 0,
"buildingId": ObjectId("5e1fe5e3d05bfb0cc5494146"),
"companyName": "The AAAAAA",
"createdAt": ISODate("1970-01-01T00:00:00Z"),
"dateHour": "2020-03-19T18",
"deviceId": ObjectId("5e1fe81ed05bfb0cc5496406"),
"gatewayId": ObjectId("5e1fe6a6d05bfb0cc5494d25"),
"minuteBucket": 1
}
预期结果：
{
"accountId": ObjectId("5e1fe45cd05bfb0cc549297d"),
"avgZoneCountNumber": 0,
"avgZoneCountNumberInstant": 0,
"buildingId": ObjectId("5e1fe5e3d05bfb0cc5494146"),
"createdAt": ISODate("1970-01-01T00:00:00Z"),
"dateHour": "2020-03-19T18",
"deviceId": ObjectId("5e1fe81ed05bfb0cc5496406"),
"gatewayId": ObjectId("5e1fe6a6d05bfb0cc5494d25"),
"minuteBucket": 1,
"serialNumber: 1, // this value should come from device object
"area": 1 // this value should come from device object
}
【问题讨论】：
-
请正确格式化代码块
-
我格式化并更新了问题
标签： mongodb mongoose mongodb-query aggregation-framework