Firebase 函数 onCreate 触发器错误 : TypeError: Cannot read property 'match' of undefined

Question

尝试部署一个为数据库触发 OnCreate 的函数，但它一直向我返回此错误。这是简单的代码和错误响应:

只是无法弄清楚为什么匹配未定义错误？

模块版本:

nodejs: Version 8.11.3
Function : deployed with node 8 runtime version. 
"firebase": "^5.3.0"
"firebase-admin": "^5.12.1"
"firebase-functions": "^1.1.0"
"typescript": "^2.5.3"

代码:

import functions = require('firebase-functions');
import admin = require('firebase-admin');
exports.functionName = functions.database.ref('/user/{uid}/email').onCreate((snap, context) => {
    console.log(snap.val());
});

问题更新:这是最新且最新的代码。我正在尝试获取新添加的对象的详细信息。

Firebase 数据库中向用户添加了新元素时出错:

TypeError: Cannot read property 'match' of undefined
    at resourceToInstanceAndPath (/srv/node_modules/firebase-functions/lib/providers/database.js:154:26)
    at dataConstructor (/srv/node_modules/firebase-functions/lib/providers/database.js:122:38)
    at Object.<anonymous> (/srv/node_modules/firebase-functions/lib/cloud-functions.js:89:32)
    at Generator.next (<anonymous>)
    at /srv/node_modules/firebase-functions/lib/cloud-functions.js:28:71
    at new Promise (<anonymous>)
    at __awaiter (/srv/node_modules/firebase-functions/lib/cloud-functions.js:24:12)
    at cloudFunction (/srv/node_modules/firebase-functions/lib/cloud-functions.js:82:36)
    at /worker/worker.js:728:24
    at <anonymous>

Answer 1

您使用的是 Cloud Functions 的“旧”语法(Firebase SDK for Cloud Functions 版本 1.0.0 之前的版本)以及 onCreate((event) => {}) 和版本您项目中的SDK版本为1.1.0。

您应该将语法更改为

.onCreate((snap, context) => {})

如 documentation 中所述