如何在Mongoose中将新值推送到嵌套数组

const mongoose = require('mongoose');

// 定义模式和模型
const Schema = mongoose.Schema;
const MyModelSchema = new Schema({
  nestedArrayField: [String]
});
const MyModel = mongoose.model('MyModel', MyModelSchema);

// 连接数据库
mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true })
  .then(() => {
    // 查找并更新文档
    MyModel.findOneAndUpdate(
      { _id: 'documentId' },
      { $push: { nestedArrayField: 'newValue' } },
      { new: true },
      (err, updatedDocument) => {
        if (err) {
          console.error(err);
        } else {
          console.log(updatedDocument);
        }
        mongoose.disconnect(); // 断开数据库连接
      }
    );
  })
  .catch((err) => {
    console.error(err);
  });