Need an assistance with Firebase Cloud Function

Question

I'm trying to write a cloud function using node.js and I'm getting this error:

TypeError: Cannot read property 'user_id' of undefined at exports.FindRoom.functions.database.ref.onWrite (/user_code/index.js:299:39) at Object. (/user_code/node_modules/firebase-functions/lib/cloud-functions.js:112:27)

From this function:

exports.FindRoom = functions.database.ref(`/FindRoom/{user_id}`).onWrite((event) =>{ var user_id = event.params.user_id; console.log("user_id",user_id); var user_question = event.data.val(); console.log("user_question",user_question); if (!event.data.val()) { return console.log('A game room was deleted from database',user_id); }

It's a first time I'm using Firebase and Cloud Functions, and the function worked well before I made npm update for Firebase. After update I'm getting this error and could not find a solution.

I believe this question was already asked? stackoverflow.com/questions/49647170/… — Doug Stevenson
– Doug Stevenson, Commented Apr 4, 2018 at 14:39

Frank van Puffelen · Accepted Answer · 2018-04-04 14:39:54Z

The path string needs to be a literal string, not a template. So replace the backticks (`) with regular (single or double) quotes:

exports.FindRoom = functions.database.ref("/FindRoom/{user_id}").onWrite(...

Rémi C. · Accepted Answer · 2018-04-04 14:52:11Z

0

I am not 100% sure but Firebase just got updated to its v1 and it changes stuff about database. I received an email this morning. You can see the changes over here.

Hope it helps!

answered Apr 4, 2018 at 14:52

Rémi C.

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2 Comments

Alex L Over a year ago

It helps a lot. Thank you!

Rémi C. Over a year ago

@AlexL I'm glaed it helped :)

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