如何使用Mongoose在mongodb中存储动态对象数组？

npm install mongoose

const mongoose = require('mongoose');

const userSchema = new mongoose.Schema({
  name: String,
  friends: [{
    name: String,
    age: Number
  }]
});

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

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 newUser = new User({
  name: 'John',
  friends: [
    { name: 'Alice', age: 25 },
    { name: 'Bob', age: 30 }
  ]
});

newUser.save()
  .then(() => {
    console.log('User saved successfully');
  })
  .catch((error) => {
    console.error('Error saving user', error);
  });

User.find({ 'friends.age': 25 })
  .then((users) => {
    console.log('Users with friends aged 25:', users);
  })
  .catch((error) => {
    console.error('Error finding users', error);
  });