Instructions on how to modify a document's content by its unique identifier using Firebase Modular SDK (V9)

I am trying to figure out how to update an existing document for the same user ID in V9 Firebase whenever they log in, rather than creating a new one each time. Any suggestions on how to achieve this?

Current Code

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

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

Past Code that referenced document UID:

Answer №1

To properly use the setDoc() function, make sure that the first parameter is a valid DocumentReference:

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

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

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

Answer №2

If you prefer, you can also utilize the updateDoc() method.

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

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

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