Mongoose更新多个文档上的嵌套对象

const mongoose = require('mongoose');

// 连接到MongoDB数据库
mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true })
  .then(() => {
    console.log('Connected to MongoDB');
  })
  .catch((error) => {
    console.error('Failed to connect to MongoDB', error);
  });

// 定义数据模型
const userSchema = new mongoose.Schema({
  name: String,
  age: Number,
  address: {
    city: String,
    street: String
  }
});

const User = mongoose.model('User', userSchema);

// 更新多个文档上的嵌套对象
const updateQuery = { age: { $gte: 18 } }; // 查询条件，更新年龄大于等于18岁的用户
const updateOperation = { $set: { 'address.city': 'New York' } }; // 更新操作，将地址的城市改为New York

User.updateMany(updateQuery, updateOperation)
  .then((result) => {
    console.log(`${result.nModified} documents updated`);
  })
  .catch((error) => {
    console.error('Failed to update documents', error);
  });