Question

我有一个用户架构，其中包含多个注释，并且该注释属于一个userId

const UserSchema = new Schema({
    _id: Schema.Types.ObjectId,
    email: {type: String, required: true, trim: true, lowercase: true, unique: true},
    notes: [{type: Schema.Types.ObjectId, ref: 'Note'}]
});

const NoteSchema = new Schema({
    userId: {type: mongoose.Types.ObjectId, ref: 'User'},
    content: {type: String, required: true, trim: true, lowercase: true},
});

我正在尝试使用以下语法（来自文档）用注释填充我的用户

const user = await User.findById(mongoose.Types.ObjectId("5bd2a8c4963ac00f57a18074"))
    .populate('notes')
    .exec(function (err, result) {
        console.log(result);
    });

但是它返回没有Notes数据的用户。知道我做错了什么吗？

Answer 1

NoteSchema是问题所在：

userId：{类型：mongoose.Types.ObjectId，编号：'User'}

在下面使用

userId: {type: mongoose.Schema.Types.ObjectId, ref: 'User'}
// OR
userId: {type: Schema.Types.ObjectId, ref: 'User'}
// OR
userId: {type: Schema.ObjectId, ref: 'User'} // For backword compatibility

注意：-：该模式应始终使用mongoose.Schema.Types。并且mongoose.Types.ObjectId可以与猫鼬实现一起使用。

我能够正确获取文档（以下代码）：

var mongoose = require('mongoose'),
Schema = mongoose.Schema;


const NoteSchema = new Schema({
    userId: {type: Schema.Types.ObjectId, ref: 'UserTest'},
    content: {type: String, required: true, trim: true, lowercase: true},
});

const UserSchema = new Schema({
  _id: Schema.Types.ObjectId,
  email: {type: String, required: true, trim: true, lowercase: true, unique: true},
  notes: [{type: Schema.Types.ObjectId, ref: 'NoteTest'}]
});

var Note = mongoose.model('NoteTest', NoteSchema);
var User = mongoose.model('UserTest', UserSchema);


User.find({_id : mongoose.Types.ObjectId("5bd2c84dd79cc5d8b1c62964")})
  .populate('notes')
  .exec(function (err, result) {
      console.log("result.....", JSON.stringify(result));
  });

输出：

[
  {
    "_id": "5bd2c84dd79cc5d8b1c62964",
    "email": "hardik@com.com",
    "notes": [
      {
        "_id": "5bd2c869d79cc5d8b1c62965",
        "content": "ABC",
        "userId": "5bd2c84dd79cc5d8b1c62964"
      },
      {
        "_id": "5bd2c88ad79cc5d8b1c62966",
        "content": "DEF",
        "userId": "5bd2c84dd79cc5d8b1c62964"
      }
    ]
  }
]

此基本设置忽略了猫鼬填充

1 个答案: