MongoDB Mongoose如何从数组中删除对象

const mongoose = require('mongoose');

// 连接到MongoDB数据库
mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true });

// 创建User模型
const User = mongoose.model('User', {
  name: String,
  friends: [{ type: mongoose.Schema.Types.ObjectId, ref: 'User' }]
});

const userId = '1234567890'; // 假设要删除对象的用户ID
const friendId = '0987654321'; // 假设要删除的朋友对象的ID

User.findOneAndUpdate(
  { _id: userId },
  { $pull: { friends: friendId } },
  { new: true }
)
  .then(updatedUser => {
    console.log(updatedUser);
  })
  .catch(error => {
    console.error(error);
  });