Firestore: "add is not a function"

Question

I try to use Firestore in Cloud functions but I faced with error

db.collection(...).doc(...).collection(...).doc(...).add is not a function at Promise

I read these topics first, second and other. But id didn't help me. The package.json looks

"firebase": "^4.3.1", "firebase-admin": "^5.5.1", "firebase-functions": "^0.7.5",

One of cloud functions

const admin = require('firebase-admin'); var db = admin.firestore();

This code from function

const currentUserMatchProm = db.collection('userMatches').doc(currentUserID).collection('test').doc(matchID).add({ 'matchID': matchID, 'matchedUserID': eventUserID, 'timestamp': timestamp, 'isActive': false }); const eventUserMatchProm = db.collection('userMatches').doc(eventUserID).collection('test').doc(matchID).add({ 'matchID': matchID, 'matchedUserID': currentUserID, 'timestamp': timestamp, 'isActive': false });

How can I fix it?

Frank van Puffelen · Accepted Answer · 2017-12-21 14:52:57Z

21

doc is document, add function is only for collection. To write data to a document, use the set function:

doc(matchID).set({ ... })

edited Dec 21, 2017 at 14:52

Frank van Puffelen

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answered Dec 21, 2017 at 14:09

Jaeseon Shin

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1 Comment

Ronnie Smith Over a year ago

Documentation says "Behind the scenes, .add(...) and .doc().set(...) are completely equivalent, so you can use whichever is more convenient." but I do see where you cannot do .doc().add()

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