firestore orderby on subproperty (subcollection)

firestore orderby on subproperty (subcollection)

By : liyifango
Date : November 22 2020, 03:01 PM
Hope this helps Using the new firestore, I have a structure that looks like this: , Looks like you have a typo in your code:
code :
db.collection('tester').orderBy('stats.posts').limit(3).get().then(function(querySnapshot) {
    querySnapshot.forEach(function(documentSnapshot) { 

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read subcollection in firestore

read subcollection in firestore

By : chrisroberts
Date : March 29 2020, 07:55 AM
hope this fix your issue You can just add doc('qZg6gkOvYHOPXHDJAqBF') after your collection('restaurants') like so:
code :
  .collection('restaurants').doc('qZg6gkOvYHOPXHDJAqBF').get().then(function(doc) {
    if (doc.exists) {
      console.log("Document data:", doc.data());
    } else {
      console.log("No such document!");
}).catch(function(error) {
    console.log("Error getting document:", error);
How to add a subcollection to firestore on c#?

How to add a subcollection to firestore on c#?

By : Jason
Date : March 29 2020, 07:55 AM
Any of those help You just create a document in the subcollection - the collection itself isn't an entity you need to create.
So if you already have a DocumentReference for something, you can use:
code :
DocumentReference topDoc = ...;
CollectionReference subCollection = topDoc.Collection("subcollection");
DocumentReference subDoc = await subCollection.AddAsync(new { Name = "Jon", Score = 10 });
DocumentReference topDoc = ...;
CollectionReference subCollection = topDoc.Collection("subcollection");
DocumentReference subDoc = subCollection.Document("subdoc");
await subDoc.CreateAsync(new { Name = "Jon", Score = 10 });
Firestore Subcollection '!=' query

Firestore Subcollection '!=' query

By : TheBoss
Date : March 29 2020, 07:55 AM
it should still fix some issue You might find success and use cases beyond this one by maintaining a user's feed and then only calling that at runtime. I utilize this method and have found I'm given a lot of freedom and Cloud Functions let me dictate what types of posts show and under what changes are new posts added to a user's feed.
The way I do it is I look for new posts via an onCreate cloud function and then look up who should see that post, etc. and add it to each of their feeds.
code :
Users (collection)
--- User1 (document)
------- Following (collection of people User1 is following)
----------- FollowingUser1 (document, contains a uid of "followed" user)
----------- FollowingUser2
exports.newReview =  functions.firestore
  .onCreate((snap, context) => {
      var reviewId = context.params.reviewId
      var reviewData = snap.data()
      var userFollowers = db.collectionGroup('following').where('uid', '==', userId)
      var followingTransaction = db.runTransaction(transaction => {
        return transaction.get(userFollowers).then(restDocs => {
          reviewData['added_via'] = 'following'
          restDocs.forEach(doc => {
            var followerId = doc.ref.parent.parent.id
            var followerRef = db.collection(`feeds/${followerId}/posts`).doc(reviewId)
            transaction.set(followerRef, reviewData);
            return true

     return followingTransaction.then(values => {
            var shouldPostToTwitter = reviewData.postToTwitter
            return Promise.resolve()
          }) .catch(error => {
            return Promise.reject(new Error("Error deleting"));
  credential: admin.credential.cert(serviceAccount),

const db = admin.firestore()
Loopback 4 - Get subcollection from Firestore

Loopback 4 - Get subcollection from Firestore

By : user3583862
Date : March 29 2020, 07:55 AM
should help you out On Firestore reading from a collection, only reads the data from that collection and not from collections under it. There is no API that automatically reads data from subcollection too.
You'll have to execute a separate read operation for each subcollection that you want to get data from.
Firestore: Getting a subcollection from a DocumentSnapshot

Firestore: Getting a subcollection from a DocumentSnapshot

By : codemaster
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , There is no get() method for CollectionReference, you need a DocumentReference.
There is nothing wrong with the current situation, you probably want to use getDocuments() since there are no subcollections under your collection, but documents
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