Updating multiple docs in firebase

Question

let's say that i wanna update a serie of documents, i'm doing it using forEach like this.

students.forEach(async (name) => {
      const docRef = doc(db, "students", name);
      await updateDoc(docRef, {
        school: "Some School",
      });
    });

And it's working fine, but i was wondering if that's bad for sending too many requests or something. Is there another better/smarter way to do it?

score 1 · Accepted Answer · answered Jul 15 '22 at 00:22

There's nothing particularly "bad" about this given what you've shared, unless you are also observing some behavior that you don't like.

If your intent is to update all of the documents atomically (up to a limit of 500 in a batch), so that any failures or interruptions won't leave the set of documents in an inconsistent state, you are better off using a batch write instead. But that won't necessarily give you any better performance or other improved runtime behavior.

score 1 · Answer 2 · answered Jul 15 '22 at 01:08

I usually recommend against using await in a scenario where you are using updateDoc on a sequence of documents, as it's actually faster to let the updates run in parallel. For more on this, see What is the fastest way to write a lot of documents to Firestore?

But the await here is harmless, since using await in a forEach has no impact on the other operations in that same forEach. For more on this, see: Using async/await with a forEach loop If you were to use a for of loop though, be sure to remove the await for improved throughput.

Updating multiple docs in firebase

2 Answers2