在Node.js中使用Mongoose更新嵌套字段

npm install mongoose

const mongoose = require('mongoose');

mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true });

const userSchema = new mongoose.Schema({
  name: String,
  address: {
    street: String,
    city: String,
    country: String
  }
});

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

User.findOneAndUpdate(
  { name: 'John' }, // 查询条件
  { 'address.city': 'New York' }, // 更新的字段
  { new: true }, // 返回更新后的文档
  (err, user) => {
    if (err) {
      console.error(err);
    } else {
      console.log(user);
    }
  }
);