CODEWITHSUNDEEP
javascriptfirebasegoogle-cloud-firestore
dkorsakas
dkorsakas

Reputation: 177

Converting firebase 8 code to firebase 9 code (web, javascript) to fetch collection within collection

Hello I would like to convert the following firebase 8 code to firebase 9 and have no clue how to do it - any help would be welcome!

This piece of code should go inside the userDoc and then fetch the collection that is insdie that document and return all of the posts that belong to that user

if (userDoc) {
    user = userDoc.data()
    const postsQuery = userDoc.ref
        .collection('posts')
        .where('published', '==', true)
        .orderBy('createdAt', 'desc')
        .limit(5)
    posts = (await postsQuery.get()).docs.map(postToJSON)
}

enter image description here

Upvotes: 2

Views: 542

Answers (1)

Dharmaraj
Dharmaraj

Reputation: 50850

Firestore's documentation has examples for both V8 and V9 so you can easily compare them and modify your code. Just switch to modular tab for the new syntax. The code in question would be like:

import { collection, query, where, getDocs, orderBy, limit } from "firebase/firestore";

const q = query(collection(db, "posts"), where("published", "==", true), orderBy("createdAt", "desc"), limit(5));

const querySnapshot = await getDocs(q);

posts = querySnapshot.docs.map(postToJSON)

Upvotes: 1

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