填充调用后模拟Mongoose对象

const mongoose = require('mongoose');

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

const User = mongoose.model('User', { name: String, age: Number });

const user = new User({ name: 'John', age: 25 });
user.save()
  .then(() => {
    console.log('User created');
  })
  .catch((error) => {
    console.error('Error creating user', error);
  });

User.find()
  .then((users) => {
    console.log('Users:', users);
  })
  .catch((error) => {
    console.error('Error reading users', error);
  });

User.updateOne({ name: 'John' }, { age: 30 })
  .then(() => {
    console.log('User updated');
  })
  .catch((error) => {
    console.error('Error updating user', error);
  });

User.deleteOne({ name: 'John' })
  .then(() => {
    console.log('User deleted');
  })
  .catch((error) => {
    console.error('Error deleting user', error);
  });