我试图过滤从查找操作接收到的mongodb数据上的数据，但我无法弄清楚，任何帮助将不胜感激（也希望我能正确地解释问题，让我知道是否我可以对此进行改进）
让我先共享输出：
{
"success": true,
"message": [
{
"paymentId": "",
"cartId": [
"5bd072dca17e9a410326cbcc"
],
"itemId": [
{
"paymentId": "",
"cartId": [
"5bd072dca17e9a410326cbcc"
],
"status": "init",
"cod": false,
"_id": "5bd07333a17e9a410326cbcd",
"userId": "5b711d6572b22b0ecc361345",
"productId": "5ba5f95d0ba5cc3a8d1d98ae",
"productDetails": {
"_id": "5ba5f95d0ba5cc3a8d1d98ae",
"stock": 5000,
"gst": 12,
"images": [
"http://houzzcart.com/uploads/1538155710187.jpg",
"http://houzzcart.com/uploads/1538155710184.jpg",
"http://houzzcart.com/uploads/1538155710186.jpg",
"http://houzzcart.com/uploads/1538155710185.jpg"
],
"visible": true,
"title": "Vertical Garden By Houzzcart",
"subTitle": "Green Walls",
"basePrice": 999,
"measurementUnit": "Pc",
"weight": 0.5,
"slug": "vertical-garden-by-houzzcart-7473",
"sellerId": {
"_id": "5b5c747d8209982630bbffe5",
"pin": "110008",
"companyName": "Retail ",
"firstName": "Houzzcart ",
"lastName": "Singh "
},
"commission": 10,
"offerId": {
"discount": 52,
"title": "Discount 52%"
},
"sellingPrice": 699,
"discountedPrice": "336",
"discount": 52,
"finalPrice": 376,
"gstTax": "40",
"deliveryCharges": 0
},
"quantity": 1,
"gst": 12,
"discount": 52,
"commission": 10,
"__v": 0,
"createdAt": "2018-10-24T13:27:15.446Z",
"updatedAt": "2018-10-24T13:27:15.446Z"
},
{
"_id": "5bceefc85bba4826d22f7435",
"paymentId": "",
"cartId": [
"5bb71466b7c4842a42e43541"
],
"status": "init",
"cod": false,
"userId": "5b711d6572b22b0ecc361345",
"productId": "5b9f899a175f473fd9c15c86",
"productDetails": {
"_id": "5b9f899a175f473fd9c15c86",
"stock": 100,
"gst": 18,
"images": [
"http://houzzcart.com/uploads/1537182178833.jpg",
"http://houzzcart.com/uploads/1537182178834.jpg"
],
"visible": true,
"subTitle": "Corsa Series",
"title": "Centre Hole Basin Mixer Corsa",
"weight": 1,
"basePrice": 100,
"measurementUnit": "Pc",
"sellerId": {
"_id": "5b5c747d8209982630bbffe5",
"pin": "110008",
"companyName": "Retail ",
"firstName": "Houzzcart ",
"lastName": "Singh "
},
"slug": "centre-hole-basin-mixer-corsa-1",
"commission": 10,
"offerId": {
"discount": 51,
"title": "Discount 51%"
},
"sellingPrice": 499,
"discountedPrice": "245",
"discount": 51,
"finalPrice": 289,
"gstTax": "44"
},
"quantity": 1,
"gst": 18,
"discount": 51,
"commission": 10,
"__v": 0,
"createdAt": "2018-10-23T09:54:16.534Z",
"updatedAt": "2018-10-23T09:54:16.534Z"
},
{
"_id": "5bceefc85bba4826d22f7436",
"paymentId": "",
"cartId": [
"5bc097ede250fe310785c328"
],
"status": "init",
"cod": false,
"userId": "5b711d6572b22b0ecc361345",
"productId": "5ba527a10ba5cc3a8d1d9884",
"productDetails": {
"_id": "5ba527a10ba5cc3a8d1d9884",
"stock": 5000,
"gst": 18,
"images": [
"http://houzzcart.com/uploads/1537551879671._SL1500_",
"http://houzzcart.com/uploads/1537551879672._SL1500_",
"http://houzzcart.com/uploads/1537552273321._SL1500_",
"http://houzzcart.com/uploads/1537552273323._SL1500_",
"http://houzzcart.com/uploads/1537552273324._SL1500_",
"http://houzzcart.com/uploads/1537552273325._SL1500_",
"http://houzzcart.com/uploads/1537552273320.PNG",
"http://houzzcart.com/uploads/1537612831788._SL1001_",
"http://houzzcart.com/uploads/1537612831787._SL1001_",
"http://houzzcart.com/uploads/1537612831786._SL1080_"
],
"visible": true,
"title": "Hanging Flower Wisteria By Houzzcart ",
"basePrice": 90,
"weight": 0.5,
"subTitle": "Vertical Hanging Flower ",
"sellerId": {
"_id": "5b5c747d8209982630bbffe5",
"pin": "110008",
"companyName": "Retail ",
"firstName": "Houzzcart ",
"lastName": "Singh "
},
"slug": "hanging-flower-wisteria-by-houzzcart-1",
"measurementUnit": "Pc ",
"commission": 10,
"offerId": {
"discount": 52,
"title": "Discount 52%"
},
"sellingPrice": 110,
"discountedPrice": "53",
"discount": 52,
"finalPrice": 62,
"gstTax": "10"
},
"quantity": 1,
"gst": 18,
"discount": 52,
"commission": 10,
"__v": 0,
"createdAt": "2018-10-23T09:54:16.534Z",
"updatedAt": "2018-10-23T09:54:16.534Z"
},
{
"_id": "5bceefc85bba4826d22f7437",
"paymentId": "",
"cartId": [
"5bc497e23dab3b5513f101ec"
],
"status": "init",
"cod": false,
"userId": "5b711d6572b22b0ecc361345",
"productId": "5ba103c96d529f30df60dd67",
"productDetails": {
"_id": "5ba103c96d529f30df60dd67",
"stock": 4000,
"gst": 18,
"images": [
"http://localhost:3000/uploads/1537969242350.png"
],
"visible": true,
"title": "16074 - 3",
"subTitle": "CANYON RANCH",
"basePrice": 65,
"measurementUnit": "26.2",
"weight": 18,
"slug": "16074-3-1",
"sellerId": {
"_id": "5b6a97cf23d79b3625a5be56",
"pin": "123455",
"companyName": "Linkites",
"firstName": "Piyush",
"lastName": "Jain",
"pickupAddress": {
"_id": "5b92251d35c5ba2936dc4442",
"pickupLocationId": "",
"pickupLocation": "VIRGIN SURFACE",
"name": "Gunjan Singh",
"email": "houzzcart@gmail.com",
"addressLine1": "W-6, West Patel Nagar, Basement Opp. Metro Pilar No. 234 ,",
"addressLine2": " New Delhi, DELHI ,India ",
"city": "New Delhi",
"state": "Delhi",
"pincode": 110015,
"phone": 8368069699,
"companyId": "",
"status": "Active",
"createdAt": "2018-09-07T07:13:33.916Z",
"__v": 0
}
},
"commission": 10,
"offerId": {
"discount": 30,
"title": "Flat 30%"
},
"sellingPrice": 200,
"discountedPrice": "140",
"discount": 30,
"finalPrice": 495,
"gstTax": "25"
},
"quantity": 3,
"gst": 18,
"discount": 30,
"commission": 10,
"__v": 0,
"createdAt": "2018-10-23T09:54:16.535Z",
"updatedAt": "2018-10-23T09:54:16.535Z"
},
{
"_id": "5bceefc85bba4826d22f7438",
"paymentId": "",
"cartId": [
"5bcade6cb5669e200ab5a301"
],
"status": "init",
"cod": false,
"userId": "5b711d6572b22b0ecc361345",
"productId": "5bacd386b02b216aa29132da",
"productDetails": {
"_id": "5bacd386b02b216aa29132da",
"stock": 100,
"gst": 18,
"images": [
"http://houzzcart.com/uploads/1538054447865.png",
"http://houzzcart.com/uploads/1538054464640.png",
"http://houzzcart.com/uploads/1538054464638.png",
"http://houzzcart.com/uploads/1538054464639.png"
],
"visible": true,
"title": "Avian Solid Wood Bar Cabinet In Warm Chestnut Finish",
"subTitle": "Bar Furniture",
"basePrice": 5000,
"measurementUnit": "Per Pc",
"weight": 60,
"slug": "avian-solid-wood-bar-cabinet-in-warm-chestnut-finish-3283",
"sellerId": {
"_id": "5b5c747d8209982630bbffe5",
"pin": "110008",
"companyName": "Retail ",
"firstName": "Houzzcart ",
"lastName": "Singh "
},
"commission": 10,
"sellingPrice": 10000,
"offerId": {
"discount": 54,
"title": "Furniture 1"
},
"discountedPrice": "4600",
"discount": 54,
"finalPrice": 5428,
"gstTax": "828"
},
"
],
"status": "placed",
"cod": true,
"_id": "5bd07333a17e9a410326cbce",
"userId": {
"activity": {
"loginCount": 0,
"dateEstablished": "2018-08-13T05:55:49.873Z",
"lastLogin": "2018-08-13T05:55:49.873Z"
},
"env": "development",
"isAuth": false,
"isEmailVerified": true,
"isAdminUser": false,
"isRetailer": false,
"isServiceProvider": false,
"mobile": "",
"isEmailSend": false,
"profile_picture": "http://localhost:3000/uploads/1538032590714.png",
"street": "muktanand parisar",
"otp": 0,
"city": "Dhamnod",
"state": "m.p.",
"pin": "1231231313",
"GSTIN": "",
"registerNumber": "",
"shopName": "",
"mobileNumber": "9753945608",
"companyName": "Amba villa",
"companyAddress": "",
"address": "asdsadsadasd",
"firstName": "v",
"lastName": "p",
"prime": false,
"isBlocked": false,
"status": 10,
"deliveryAddress": [
"5b8780d566650e11bf8524e0",
"5b8e24de8dbd5413a6b7c0ec",
"5b8e52623fc01b1fc1f97fe2",
"5bc09382e250fe310785c326",
"5bc09387e250fe310785c327",
"5bc57dec90e14d176e3311e7",
"5bc57df890e14d176e3311e8",
"5bc6d084e1f15e105951c3cc",
"5bc6d115e1f15e105951c3cd",
"5bc6d156e1f15e105951c3ce",
"5bc6d15ee1f15e105951c3cf",
"5bc6d227e1f15e105951c3d0",
"5bc6d2d0e1f15e105951c3d1",
"5bc6d364e1f15e105951c3d2",
"5bc6d376e1f15e105951c3d3",
"5bc6d489e1f15e105951c3d4",
"5bc6d4e1e1f15e105951c3d5",
"5bc6d63ce1f15e105951c3d6",
"5bc6dbcce1f15e105951c3d7",
"5bc6dc1ee1f15e105951c3d8",
"5bc6e316e1f15e105951c3d9",
"5bc82e4056c24e1feecf4fe0",
"5bcb1138a42ad42fc5852480",
"5bd15d690a7ac510fc4260d0",
"5bd1c2b19fcf0536d10447ea",
"5bdff0baba8bb816fda10a48"
],
"inviteLink": null,
"deviceType": null,
"deviceToken": null,
"_id": "5b711d6572b22b0ecc361345",
"isAdminRead": false,
"email": "er.vikaspatidar@gmail.com",
"createdAt": "2018-08-13T05:55:49.885Z",
"updatedAt": "2018-11-05T07:26:50.776Z",
"__v": 0,
"shippingAddress": []
},
"orderId": "OHC18102417",
"totalDiscount": 336,
"totalGST": 40,
"totalProduct": 1,
"totalBasePrice": 999,
"totalCommision": 10,
"deliveryTotal": 0,
"subTotal": 336,
"totalPayableAmount": 376,
"shippingAddress": {
"name": "vikas patidar",
"add": "sh sh",
"city": "inodre",
"state": "mp",
"country": "India",
"pin": 452001,
"phone": 9753945608
},
"createdAt": "2018-10-24T13:27:15.456Z",
"updatedAt": "2018-10-24T13:27:19.003Z",
"__v": 0
}
]
}
我要过滤itemId数组中的数据（这是对 productsorderitems 集合进行查找的结果），以仅使那些具有Sellerstrong为 5b5c747d8209982630bbffe5 的对象成为对象>，（sellerId字段位于productDetails中），这是我正在使用的命令：
[
{
$match: {orderId: "OHC18102417"}
},
{
$lookup: {
from:"productsorderitems",
localField: "userId",
foreignField: "userId",
as: "itemId"
}
},
{
$lookup: {
from:"users",
localField: "userId",
foreignField: "userId",
as: "userId"
}
},
{ $sort : { "_id": -1 } }
]
我已经尝试过其他帖子上的解决方案，但是不幸的是，它们都没有用，谢谢您的帮助。
答案 0 :(得分：1)
您是否尝试过在$lookup中使用pipeline？这些行中的一些内容：
{
$lookup: {
from: "productsorderitems",
pipeline: [{
$match: {
'productDetails.sellerId._id': ObjectId('5b5c747d8209982630bbffe5')
}
}],
as: "itemId"
}
}
答案 1 :(得分：1)
您可以使用mongodb 3.6 $lookup语法来过滤$lookup管道中的文档。
[
{ "$match": { "orderId": "OHC18102417" }},
{ "$lookup": {
"from": "productsorderitems",
"let": { "userId": "$userId" },
"pipeline": [
{ "$match": {
"$expr": { "$eq": ["$userId", "$$userId"] },
"sellerId._id": "5b5c747d8209982630bbffe5"
}}
],
"as": "itemId"
}}
]
或者您可以使用$filter聚合
[
{ "$match": { "orderId": "OHC18102417" }},
{ "$lookup": {
"from":"productsorderitems",
"localField": "userId",
"foreignField": "userId",
"as": "itemId"
}},
{ "$addFields": {
"itemId": {
"$filter": {
"input": "$itemId",
"as": "item",
"cond": { "$eq": ["$$item.sellerId._id", "5b5c747d8209982630bbffe5"] }
}
}
}}
]