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Google Cloud Functions - Count documents by id and timestamp

I am a frontend developer working on some backend stuff in a private side project aka. I am signed up for trouble.

So this is my first cloud function. I am using typescript.

I want it to:

  • Be called when a document is created in the collection [WORKS]
  • Calculate the start of the day in GMT the document was uploaded on according to the time (type is timestamp) I add to the document when uploading it using the FieldValue.serverTimestamp() [WORKS]
  • Count the number of documents which were created today and have the same id as the document we are calling the cloud function for [DOESN'T WORK]

Here's my code:

import * as functions from "firebase-functions";

import * as admin from "firebase-admin";
admin.initializeApp();

exports.countPrevious = functions.firestore
.document("entries/{documentId}")
.onCreate(async (snap, context) => {
try {
  //Get current id
  const id = snap.data().id;

  //Calculate start and end of day the entry was uploaded on (in server time)
  const startOfUploadDay = snap
    .data()
    .uploadFirestoreServerTimestamp.toDate()
    .setUTCHours(0, 0, 0, 0);

  //Query for all entries that happened for this id, today
  const queryResult = await admin.firestore()
  .collection("entries")
  .where("id", "==", id)
  .where("uploadFirestoreServerTimestamp", ">", startOfUploadDay)
  .get();

  const count = queryResult.size;

  return snap.ref.update({ previousEntries: count });
} catch (error) {
  return snap.ref.update({ status: 200 }); //200 is the code for cancelled
}
});

What am I doing wrong?

Also, is this the most efficient way of doing this? Is there a way I can just use the count() function?

Much love in advance.

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