Firebase Functions onCreate trigger Error: TypeError: Cannot read property 'match' of undefined

user_10283265 0
Viewed 2615

Trying to deploy a function with OnCreate triggered for a database but it keeps returning me this error. Here's the simple code and the error response:

Just not able to figure out why the match undefined error?

Versions of Modules: 

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"

Code: 

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());
});

Question Update: This is the latest and most updated code. I am trying to get the details of the object newly added.

Error there is a new element added to user in firebase database: 

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>
google-cloud-functions firebase-realtime-database firebase
4 Answers

You are using the "old" syntax of Cloud Functions (prior to version 1.0.0 of the Firebase SDK for Cloud Functions) with onCreate((event) => {}) and the version of the SDK in your project is version 1.1.0.

You should change the syntax to 

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

as explained in the documentation

user_33718620

I had the same error, when i deployed i had this warning:

⚠ functions: You must have a firebase-functions version that is at least 2.0.0. Please run npm i --save firebase-functions@latest in the functions folder.

after i installed the last firebase-functions version it worked.

So my solution was:

npm i --save firebase-functions@latest

user_27589610

I have this problem as well, and i believe its related to using node8 in the firebase functions. at least thats the last major change.

user_83271440

I had this problem and found that my Cloud Function trigger event type (write) and my call to firebase.database.ref('...').onChange(...) were mismatched. Once I switched the call to firebase.database.ref('...').onWrite(...), everything worked great!

Kind of a stupid mistake on my part. Hope this is helpful to someone else!

user_2690610
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