在mongodb中更新子文档(Node.js)

const mongoose = require('mongoose');

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

const mongoose = require('mongoose');

const childSchema = new mongoose.Schema({
  name: String,
  age: Number
});

const parentSchema = new mongoose.Schema({
  children: [childSchema]
});

const Parent = mongoose.model('Parent', parentSchema);

const parent = new Parent();

parent.children.push({ name: 'Alice', age: 10 });

parent.save()
  .then(() => {
    console.log('Added a new child document');
  })
  .catch((err) => {
    console.error('Error adding a new child document', err);
  });

Parent.findOneAndUpdate(
  { 'children.name': 'Alice' },
  { $set: { 'children.$.age': 11 } }
)
  .then(() => {
    console.log('Updated the age of Alice');
  })
  .catch((err) => {
    console.error('Error updating the age of Alice', err);
  });

Parent.findOneAndUpdate(
  { 'children.name': 'Alice' },
  { $pull: { children: { name: 'Alice' } } }
)
  .then(() => {
    console.log('Deleted the child document');
  })
  .catch((err) => {
    console.error('Error deleting the child document', err);
  });