How to update a document by ID using Firebase Modular SDK (V9)?

user_17978086 0
Viewed 1065

This code creates a new document every time the user logs in but my task is to update existing same user ID document if it exists else create a new one. How can I do that in V9 Firebase?

Current Code

setDoc(
  query(collectionRef),
  //     db.collection('users').doc(user.uid).set(

  {
    email: user.email,
    lastSeen: serverTimestamp(),
    photoURL: user.photoURL
  }, {
    merge: true
  }
);

Old Code that access document UID:

google-cloud-firestore firebase next.js javascript
2 Answers

The first parameter in setDoc() should be DocumentReference:

import { doc, setDoc } from "firebase/firestore"

const docRef = doc(db, "users", user.uid);

setDoc(docRef, {
  email: user.email,
  lastSeen: serverTimestamp(),
  photoURL: user.photoURL
}, {
  merge: true
}).then(() => console.log("Document updated"));
user_131306970

Alternatively, You can also use updateDoc().

import {
  doc,
  updateDoc
} from "firebase/firestore"

update(doc(db, "users", user.uid, {
  email: user.email,
  lastSeen: serverTimestamp(),
  photoURL: user.photoURL
}).then(() => console.log("Document updated"));

user_66319870
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