CODEWITHSUNDEEP
javascripthtmlfirebasegoogle-cloud-firestore
user14362725
user14362725

Reputation:

How can I get documents inside a subcollection in every document in Firebase Firestore?

How can I get all the documents inside the subcollection "userPosts" in Firebase Firestore with JavaScript? You can see my database structure in the pictures below.

Here is what I have tried:

firebase.auth().onAuthStateChanged(function(user) {

    var postRef = database.collection('posts').doc().collection('userPosts');

    postRef.get().then(snapshot => {
        setupPosts(snapshot.docs)
    })

    const posts = document.querySelector('.posts');

    const setupPosts = (data) => {

        let html = '';
        data.forEach(doc => {
            const post = doc.data();

            console.log(post)

            const li = `
            <li>
                <div class="title">${post.title}</div>
                <div class="content">${post.content}</div>
            </li>
            `;
            html += li
        })

        posts.innerHTML = html;

    }
})

What this code should do is to get the documents in the subcollection "userPosts". And it should go into every document in the collection "posts" and then go into "userPosts" and get every document in that subcollection.

First collection "posts"

Subcollection "userPosts"

Upvotes: 1

Views: 742

Answers (2)

Doug Stevenson
Doug Stevenson

Reputation: 317352

It sounds like you want a collection group query. This will give you all the documents in all subcollections named "userPosts":

const query = database.collectionGroup("userPosts")
query.get().then(querySnapshot => { ... })

Upvotes: 2

Frank van Puffelen
Frank van Puffelen

Reputation: 598668

This line makes no sense:

var postRef = database.collection('posts').doc().collection('userPosts');

The database.collection('posts').doc() creates a reference to a new, non-existing doc in the posts collection. Since you then its userPosts subcollection, this is of course going to not exist/be empty.

If you want to get the userPosts subcollection for your user argument, and you store the users based on their UID, then that'd be:

var postRef = database.collection('posts').doc(user.uid).collection('userPosts');

Upvotes: 0

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