从集合中的文档中删除子文档

// 引入MongoDB驱动程序
const MongoClient = require('mongodb').MongoClient;

// 连接到MongoDB数据库
MongoClient.connect('mongodb://localhost:27017', (err, client) => {
  if (err) throw err;

  // 选择要操作的数据库和集合
  const db = client.db('mydb');
  const collection = db.collection('mycollection');

  // 查询父文档
  const query = { _id: 'parentDocumentId' };
  collection.findOne(query, (err, parentDocument) => {
    if (err) throw err;

    // 删除子文档
    const childDocumentId = 'childDocumentId';
    const updatedParentDocument = parentDocument.children.filter(child => child._id !== childDocumentId);

    // 更新父文档
    const updateQuery = { _id: 'parentDocumentId' };
    const updateOperation = { $set: { children: updatedParentDocument } };
    collection.updateOne(updateQuery, updateOperation, (err, result) => {
      if (err) throw err;

      console.log('子文档删除成功！');
      client.close();
    });
  });
});