MongoDB：$lookup 返回空数组

Posted 2023-03-07

【中文标题】MongoDB：$lookup 返回空数组

【英文标题】：MongoDB: $lookup returns empty array [duplicate]

【发布时间】：2019-04-15 10:05:37

【问题描述】：

我有两个模型，用户和时间表，我想使用 $lookup 和猫鼬将这两个模型结合起来。

用户（模型）

    name: 
        type: String,
        required: true
    ,
    firstName: 
        String
    ,
    lastName: 
        String
    ,
    storeKey: 
        type: String,
        required: true
    ,
    avatar: String,
    birthday: String,
    phone: 
        type: String
    ,
    doc: String,
    email: 
        type: String
    ,
    password: 
        passwordHash: String,
        salt: String
    ,
    active: 
        type: Boolean,
        default: true
    ,
    deleted: 
        type: Boolean,
        default: false
    ,
    generalObservations: 
        type: String
    ,
    from: 
        type: String
    ,
    services: 
        type: Number,
        default: 0
    ,
    no_shows: 
        type: Number,
        default: 0
    ,
    // campos para integração
    integrationId: String
, 
    timestamps: true

时间表（模型）

 store: 
    type: String,
    required: true
  ,
  customer: 
    id: 
      type: ObjectId
    ,
    name: 
      type: String,
      required: true
    ,
    avatar: String,
    phone: 
      type: String
    ,
    doc: 
      type: String
    ,
  ,
  employee: 
    id: 
      type: String,
      required: true
    ,
    name: 
      type: String,
      required: true
    ,
    avatar: String,
  ,
  service: 
    id: 
      type: String
    ,
    name: 
      type: String,
      required: true
    ,
    filters: [String]
  ,
  info: 
    channel: 
      type: String,
      required: true,
      default: 'app'
    ,
    id: String,
    name: String
  ,
  scheduleDate: 
    type: String,
    required: true
  ,
  scheduleStart: 
    type: String,
    required: true
  ,
  scheduleEnd: 
    type: String,
    required: true
  ,
  value: 
    type: Number,
    required: true
  ,
  comissionType: 
    type: String,
    default: '$'
  ,
  comissionValue: 
    type: Number,
    default: 0
  ,
  status: 
    type: Number,
    required: true
  ,
  observation: String,
  paymentMethod: 
    type: Number,
    default: 0
  ,
  paymentValue: String,
  paymentChange: String
, 
  timestamps: 
    createdAt: 'created',
    updatedAt: 'updated'
  

现在我使用猫鼬进行查询：

用户聚合

  User.aggregate([
      $match: 
        storeKey: req.body.store,    
      
    ,
    
      $group: 
        _id: 
          id: "$_id",
          name: "$name",
          cpf: "$cpf",      
          phone: "$phone",
          email: "$email",
          birthday: "$birthday"      
        ,     
        totalServices: 
          $sum: "$services"
        
      
    ,
    
      $lookup: 
        from: "schedule",
        localField: "_id.id",
        foreignField: "customer.id",
        as: "user_detail"
       
    

我的查询结果是一个空数组(user_detail)，如下所示：

查询结果：

        "_id": 
            "id": "5bdb5b16ee9b7a4aa810bc62",
            "name": "Jonas com aniversário",
            "phone": "11984798494",
            "email": "[e-mail]",
            "birthday": "Thu Nov 01 2018 16:59:18 GMT-0300 (Hora oficial do Brasil)"
        ,
        "totalServices": 0,
        "user_detail": []
    

我不知道为什么，但是查询结果是一个 空数组，我尝试使用 $unwind 和 $match 但也不起作用。

编辑：

用户集合

        "_id": "5b1b1dcce1ab9a12a8eb580f",
        "password": 
            "salt": "d095f2",
            "passwordHash": "b24881ef4c43d28e93bcff5da2ce32e4287aabf77540d2465482a435a5929a63f2ba9fb7e1cc14fa4e8183d83e33854ec6153fbbb872e65a9e3f188892bf56cc"
        ,
        "name": "Anderson Zanardi",
        "cpf": "31933765828",
        "phone": "11996370565",
        "birthday": "1984-03-18",
        "email": "[e-mail]",
        "storeKey": "5b16cceb56a44e2f6cd0324b",
        "createdAt": "2018-06-09T00:22:36.464Z",
        "updatedAt": "2018-11-06T13:51:37.261Z",
        "__v": 0,
        "doc": "31933765828",
        "active": true,
        "from": "app",
        "deleted": false,
        "services": 80
    ,

时间表收集

        "_id": "5b1c20d8fc76f904849712c9",
        "customer": 
            "id": "789456",
            "name": "Gabriel Barreto",
            "phone": "11995274098",
            "cpf": "40735255814"
        ,
        "employee": 
            "id": "5b16cebd29bcf613f02b6fb4",
            "name": "Anderson Zanardi",
            "avatar": ""
        ,
        "service": 
            "filters": [
                "corte_simples",
                "corte_masculino"
            ],
            "id": "service_id",
            "name": "Corte Masculino"
        ,
        "store": "5b16cceb56a44e2f6cd0324b",
        "scheduleDate": "2018-06-07",
        "scheduleStart": "2018-06-28 13:00",
        "scheduleEnd": "2018-06-28 13:30",
        "status": 1,
        "value": 50,
        "created": "2018-06-09T18:47:52.862Z",
        "updated": "2018-06-09T18:47:52.862Z",
        "__v": 0
    ,

【参考方案1】：

Mongoose 在创建时将集合名称复数。所以你应该使用schedules而不是schedule

 "$lookup": 
  "from": "schedules",
  "localField": "_id.id",
  "foreignField": "customer.id",
  "as": "user_detail"

或者导入集合并从中提取集合名称

const Schedule = require('/schedules')

 "$lookup": 
  "from": Schedule.collection.name,
  "localField": "_id.phone",
  "foreignField": "customer.phone",
  "as": "user_detail"

【讨论】：

多元化对我有用。你拯救了我的一天