在mongoose中填充嵌套数组

const mongoose = require('mongoose');

// 定义嵌套数组中引用的模型
const childSchema = new mongoose.Schema({
  name: String
});

const parentSchema = new mongoose.Schema({
  children: [{
    type: mongoose.Schema.Types.ObjectId,
    ref: 'Child' // 引用Child模型
  }]
});

const Child = mongoose.model('Child', childSchema);
const Parent = mongoose.model('Parent', parentSchema);

// 查询Parent并填充children字段
Parent.findOne({})
  .populate('children')
  .exec((err, parent) => {
    if (err) {
      console.error(err);
    } else {
      console.log(parent);
    }
  });