将新集合添加到firestore中已有文档的云函数

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();

// 定义云函数
exports.addCollectionToDocument = functions.firestore
  .document('collection/{documentId}')
  .onUpdate((change, context) => {
    const documentId = context.params.documentId;
    const newData = change.after.data();
    
    // 在已有文档中添加新集合
    const newCollectionRef = admin.firestore().collection('collection').doc(documentId).collection('newCollection');
    
    // 添加新文档到新集合中
    const newDocumentData = { field1: 'value1', field2: 'value2' };
    return newCollectionRef.add(newDocumentData);
  });