CODEWITHSUNDEEP
javascriptfirebasegoogle-cloud-firestore
Oyetola Timmy
Oyetola Timmy

Reputation: 1

how do i get the type of change that happened in onSnapshot in firebase

how do i get the type of change that happened in onSnapshot in firebase, i want to use a if statement on the change to know the type of snapshot change if it was a ' add, remove, modified'

Upvotes: 0

Views: 543

Answers (1)

Renaud Tarnec
Renaud Tarnec

Reputation: 83163

It is explained here in the doc. The provided example is:

import { collection, query, where, onSnapshot } from "firebase/firestore";

const q = query(collection(db, "cities"), where("state", "==", "CA"));
const unsubscribe = onSnapshot(q, (snapshot) => {
  snapshot.docChanges().forEach((change) => {
    if (change.type === "added") {
        console.log("New city: ", change.doc.data());
    }
    if (change.type === "modified") {
        console.log("Modified city: ", change.doc.data());
    }
    if (change.type === "removed") {
        console.log("Removed city: ", change.doc.data());
    }
  });
});

Upvotes: 1

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