I've got stuck with Firestore Functions Batch Writing-CodePudding

What I want: every time a new user is created, let's grab his restaurants and put them into a restaurant collection, and inside that, create a document with the restaurant's name and put the user's other restaurants inside that

=> why? so this way I can see which restaurants are connected via a user.

The code is listed below. It doesn't work, this is what I get in the Logs Explorer: "FirebaseError: Type does not match the expected instance. Did you pass a reference from a different Firestore SDK?"

Is this how batch writing should be done? I've looked up on that error message, and as far as I understood it using "doc" from firestore should solves it, so I'm bit lost here because that's what I'm doing.

import * as functions from 'firebase-functions';
import { doc, writeBatch } from '@firebase/firestore';
import * as admin from 'firebase-admin';
import { credentials, privateDatabaseURL } from './config/firebase';

admin.initializeApp({
    credential: admin.credential.cert({
        privateKey: credentials.private_key,
        projectId: credentials.project_id,
        clientEmail: credentials.client_email,
    }),
    databaseURL: privateDatabaseURL,
});

exports.writeToFirestore = functions.firestore
    .document('users/{user_name}')
    .onWrite((change, context) => {
        const data = change.after.data();

        if (!data) {
            return null;
        }

        const db = admin.firestore();

        const restaurants = data.restaurants;
        // @ts-ignore
        const batch = writeBatch(db);

        for (let i = 0; i < restaurants.length; i  ) {
            const rest = restaurants[i];
            // @ts-ignore
            const restRef = doc(db, 'restaurants', rest);

            for (let j = 0; j < restaurants.length; j  ) {
                const rest2 = restaurants[j];

                if (rest === rest2) {
                    continue;
                }

                batch.set(
                    restRef,
                    {
                        restaurants: rest2,
                    },
                    { merge: true }
                );
            }
        }

        return batch.commit();
    });

CodePudding user response：

It seems that you have two instances of the Firestore class in your code, and they're not compatible. It's hard to say where this problem is coming from, as I don't know which line is failing. But a simple fix is to not create a second Firestore instance, and instead grab it from the change object that functions passes to your code:

To do that, change:

const db = admin.firestore();

To:

const db = change.after.ref.firestore;