如何在填充（猫鼬）中使用查找答案

【问题标题】：how to use find in populate (mongoose)如何在填充（猫鼬）中使用查找
【发布时间】：2021-04-19 10:41:00
【问题描述】：

我想用员工 ID、员工姓名、项目名称匹配一个字符串

我的模特：（员工）

const employeeSchema = new mongoose.Schema(
  {
    employeeID: { type: String, unique: true, required: true },
    departmentID: { type: mongoose.Types.ObjectId, ref: 'Department', default: null },
    employeeName: { type: String, required: true },
    gender: { type: String, default: "", enum: ["Male", "Female"] },
    designation: { type: String, default: "" },
    email: { type: String, default: null },
    branchName: { type: String, default: "" },
    employeeType: { type: String, default: "" },
    jobStatus: { type: String, default: "" },
    joiningDate: { type: Date, default: "" },
    leavingDate: { type: Date, default: "" },
    comments: { type: String, default: "" },
    managerID: { type: mongoose.Types.ObjectId, ref: 'Employee', default: null },
    region: { type: String, default: "" },
  }
);

（项目）

const projectSchema = new mongoose.Schema(
  {
    projectName: {type: String, required: true},
    tech: {type: String, required: true},
    startDate: {type: Date, required:true},
    endDate: {type: Date, required:true},
    customerID:{type:mongoose.Types.ObjectId, ref:'Customer'}
  }
);

（员工-项目）

const employeeProjectSchema = new mongoose.Schema(
  {
    empID: {type: mongoose.Types.ObjectId, required: true, ref: 'Employee'},
    projectID: {type: mongoose.Types.ObjectId, required: true, ref: 'Project'},
    allocation: {type: [Number]},
    assignStartDate: {type: Date},
    assignEndDate: {type: Date},
  }
);

我正在从作为我的主表的员工项目表中运行查询。

我想做的是将字符串与employeeID 和employeeName(employee table) 以及projectName(project table) 匹配。我现在在做什么（这是错误的）

async rpSearch(data): Promise<any> {
    try {
      const result = await MongooseEmployeeProject.find()
      .populate({
        path: 'empID',
        select: 'employeeID employeeName designation region comments resourceManager',
        match:{
          type:{data}
        }
      })
      .populate({
        path: 'projectID',
        select: 'projectName tech startDate endDate customerID'
        match:{
          type:{data}
      })

请指导我

【问题讨论】：

标签： mongodb mongoose mongoose-populate

【解决方案1】：

首先，path 必须是架构的字段名称。您将path 设置为“employeeID”，但“empID”作为employeeProjectSchema 的字段名称是正确的。

其次，您设置了match，但您的employeeSchema 和employeeProjectSchema 中都没有type 字段。所以你必须删除match。

async rpSearch(data): Promise<any> {
    try {
      const result = await MongooseEmployeeProject.find()
      .populate({
        path: 'empID',
        select: 'employeeID employeeName designation region comments resourceManager'
      })
      .populate({
        path: 'projectID',
        select: 'projectName tech startDate endDate customerID'
      })

【讨论】：

搞错了，和你说的一样