如何在mongoDB中进行更深层次的查找?深度> 2

如何解决如何在mongoDB中进行更深层次的查找?深度> 2

我有三个收藏: ServiceCate存储有关HairSalon内部服务的信息

ServiceCate

{
    "_id" : ObjectId("5f64cb4d11eaeaf154047d30"),"serviceCode" : NumberLong(2),"serviceName" : "Take earwax"
}
{
    "_id" : ObjectId("5f64cb9511eaeaf154047deb"),"serviceCode" : NumberLong(3),"serviceName" : "Shampoo"
}
{
    "_id" : ObjectId("5f64cbec11eaeaf154047eb3"),"serviceCode" : NumberLong(4),"serviceName" : "Haircuts"
}

付款的收款商店信息。

付款

{
    "_id" : ObjectId("5f64cd8611eaeaf15404825a"),"paymentCode" : NumberLong(10),"customerCode" : "2000000001","orderNumber" : "TT20000001","date" : ISODate("2020-06-01T00:07:00.000Z"),"staffCode" : NumberLong(3)
}
{
    "_id" : ObjectId("5f64cdc011eaeaf1540482ea"),"paymentCode" : NumberLong(11),"customerCode" : "2000000002","orderNumber" : "TT20000002","staffCode" : NumberLong(3)
}
{
    "_id" : ObjectId("5f64ce0111eaeaf15404837c"),"paymentCode" : NumberLong(12),"customerCode" : "2000000003","orderNumber" : "TT20000003","staffCode" : NumberLong(4)
}

并且PaymentDetails存储有关每个服务(理发,洗发水……)的详细付款的所有信息

付款明细

{
    "_id" : ObjectId("5f64cea611eaeaf154048508"),"paymentDetailCode" : NumberLong(1),"money" : "180000.0"
}

{
    "_id" : ObjectId("5f64cfed11eaeaf154048897"),"paymentDetailCode" : NumberLong(20),"money" : "180000.0"
}
{
    "_id" : ObjectId("5f64d2c311eaeaf154048fea"),"money" : "180000.0"
}

我想获得一个订单号(一个人)的付款,并详细支付美发沙龙的服务费用(例如HairCut,Sampo,Take Earwax)。

db.Payments.aggregate([
{
    $match: {
       $and:[{"orderNumber": "TT20000001"}]
    }
},{
  $lookup: {
    from: "PaymentDetails",localField: "paymentCode",foreignField: "paymentCode",as: "PaymentDetails"
  }
},// {
//   $lookup: {
//     from: "ServiceCate",//     localField: "PaymentDetails.serviceCode",//     foreignField: "serviceCode",//     as: "PaymentDetails.serviceCode",//   }
// },]);

以下是我的结果:

{
    "_id" : ObjectId("5f64cd8611eaeaf15404825a"),"staffCode" : NumberLong(3),"PaymentDetails" : [ 
        {
            "_id" : ObjectId("5f64cea611eaeaf154048508"),// I want to populate this field
            "money" : "180000.0"
        },{
            "_id" : ObjectId("5f64cfed11eaeaf154048897"),{
            "_id" : ObjectId("5f64d2c311eaeaf154048fea"),// I want to populate this field
            "money" : "180000.0"
        }
    ]
}

我想填充“ serviceCode”字段以获取详细信息服务,我已添加了此代码,但是它不起作用。

 {
   $lookup: {
     from: "ServiceCate",localField: "PaymentDetails.serviceCode",foreignField: "serviceCode",as: "PaymentDetails.serviceCode",}
 }

我尝试了很多次Google搜索。我还发现此链接enter link description here似乎是我的问题,我已经尝试过但无法正常工作。请帮我检查一下。非常感谢你

解决方法

此处需要2级查找。该查询将获取ServiceCate详细信息:

db.Payments.aggregate([
   {
      "$match": {
         orderNumber: "TT20000001"
      }
   },{
      "$lookup": {
         "from": "PaymentDetails","let": {
            "pCode": "$paymentCode"
         },"pipeline": [
            {
               "$match": {
                  "$expr": {
                     "$eq": [
                        "$paymentCode","$$pCode"
                     ]
                  }
               }
            },{
               "$lookup": {
                  "from": "ServiceCate","let": {
                     "sCode": "$serviceCode"
                  },"pipeline": [
                     {
                        "$match": {
                           "$expr": {
                              "$eq": [
                                 "$serviceCode","$$sCode"
                              ]
                           }
                        }
                     }
                  ],"as": "ServiceCate"
               }
            }
         ],"as": "PaymentDetails"
      }
   }
]).pretty();

这是输出:

{
    "_id" : ObjectId("5f64e9e92240b900afe16fc7"),"paymentCode" : NumberLong(10),"customerCode" : "2000000001","orderNumber" : "TT20000001","date" : ISODate("2020-06-01T00:07:00Z"),"staffCode" : NumberLong(3),"PaymentDetails" : [
        {
            "_id" : ObjectId("5f64eaed2240b900afe16fc8"),"paymentDetailCode" : NumberLong(1),"serviceCode" : NumberLong(2),"money" : "180000.0","ServiceCate" : [
                {
                    "_id" : ObjectId("5f64e8f82240b900afe16fc2"),"serviceName" : "Take earwax"
                }
            ]
        },{
            "_id" : ObjectId("5f64eb431476f6ad01ecbb44"),"paymentDetailCode" : NumberLong(20),"serviceCode" : NumberLong(3),"ServiceCate" : [
                {
                    "_id" : ObjectId("5f64e94a1476f6ad01ecbb40"),"serviceName" : "Shampoo"
                }
            ]
        },{
            "_id" : ObjectId("5f64eb541476f6ad01ecbb45"),"serviceCode" : NumberLong(4),"ServiceCate" : [
                {
                    "_id" : ObjectId("5f64e9581476f6ad01ecbb41"),"serviceName" : "Haircuts"
                }
            ]
        }
    ]
}

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