我怎样才能 return 一个 mongo 填充调用的子集？

Question

我正在使用 mongo db 'ref' 功能将 table 中的对象填充到我正在 returning

的文档中

这里是存储对象ID ref

的table

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const StaticAssignmentSchema = new Schema({
  affiliation: { type: String },

  REF_person: [{ type: Schema.Types.ObjectId, ref: 'users' }],
});

module.exports = StaticAssignmentNew = mongoose.model('staticassignments', StaticAssignmentSchema);

这是我的用户 table 架构

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const UserSchema = new Schema({
  name: { type: String },
  phone: { type: String },
  password: { type: String },
  affiliation: { type: String },
  timezone: { type: String },
  date: { type: Date, default: Date.now },
});

module.exports = User = mongoose.model('users', UserSchema);

这是我从 mongo

获取数据的方式

  var query = { affiliation: affiliation };
  var ret = await StaticAssignment.findOne(query).populate('REF_person');

其中 return 如下：

{
  "_id": "61a8376154377e5704ae79cf",
  "affiliation": "800_800",
  "REF_person": [{
    "_id": "5e441bd5332359211c0403fb",
    "name": "Frank",
    "phone": "8008008001",
    "password": "a$T9wYLE3v/n8S4GB.oyYOmCsGUdxXQiOjpiDaG0JGbKy",
    "affiliation": "800_800",
    "timezone": "America/Los_Angeles",
    "date": "2020-02-12T15:37:57.167Z"
  }]
}

但是，我想 return 填充调用的一个子集：

{
  "_id": "61a8376154377e5704ae79cf",
  "affiliation": "800_800",
  "REF_person": [{
    "_id": "5e441bd5332359211c0403fb",
    "name": "Frank",
    "phone": "8008008001",
  }]
}

我可以对 return 子集做什么？

谢谢楼主！

答案：

  var query = { affiliation: affiliation };
  var ret = await StaticAssignment.findOne(query)
  .populate({path: 'REF_person', select: '_id name phone'});

Answer 1

尝试var ret = await StaticAssignment.findOne(query).populate({path: 'REF_person', select: 'name phone'});

查看此页面：https://www.codegrepper.com/code-examples/whatever/mongoose+populate+select+fields

我怎样才能 return 一个 mongo 填充调用的子集？

how can I return a subset of a mongo populate call?

node.js

mongodb

mongoose

populate