orderByChild not working

[tegument]

I have items stored in firebase with a 'createdAt' property which is the server TIMESTAMP. The TIMESTAMP value is being set correctly, but when querying using orderByChild('createdAt') the order is not correct.

I have verified that the same query run with the firebase javascript API works as expected:

firestack.database.ref('images').orderByChild('createdAt').once('value', (snapshot)=>{ // snapshot not ordered by correctly });

Firebase javascript API:

firebaseApp.database().ref('images').orderByChild('createdAt').once('value', (snapshot)=>{ // snapshot ordered correctly });

I have an index set in my firebase rules but can't seem to get Firestack to use the orderByChild query

[tegument]

If I use the following query the result is in the correct order:

fsImageRef.orderByChild('createdAt').on("child_added", function(snapshot) { console.log(snapshot.val().createdAt); });

Am I not using the correct method? I just need to load all by createdAt

[auser]

What platform are you testing it on or is it both (iOS/Android)?

[tegument]

I'm only testing on android at the moment.

I'm also having the same issue with the following query:

Works with Firebase JS API:
imagePageRef = firebaseApp.database().ref('feeds/'+uid).orderByChild('createdAt').endAt(lastItemKey).limitToLast(pageCount + 1);

Doesn't work with Firestack:
imagePageRef = firestack.database.ref('feeds/'+uid).orderByChild('createdAt').endAt(lastItemKey).limitToLast(pageCount + 1);

Firestack doesn't return correct order and when calling again to get next 'page' of posts based on the last item key endAt it ignores this and returns that last items.

[auser]

Great. I'll take a look... thanks for reporting!

Does it work on iOS as expected?

[tegument]

Np! I'd love to help troubleshoot this further and looked through the JS/Java to see if I could find anything. Please let me know what you find so I can possibly be a better help in the future haha

[tegument]

I haven't been testing on iOS yet, but if I do i'll let you know.

[auser]

I found it, I think. I haven't been able to test it yet, but I'm pretty certain I know the issue

[tegument]

Awesome! let me know if you have a patch and I can test it out

[auser]

@tegument I just pushed a branch called feature/query. Can you try it out there?

[tegument]

i'm using the following query:

imagePageRef = firestack.database.ref(dbPath).orderByChild('createdAt').endAt(lastItemKey).limitToLast(itemsPerPage + 1);

but receive the following error:

"You can't combine multiple orderBy calls!"

[auser]

Yes. I know the fix for this. Apologies about the delay. I've been jet lagged from my trip!

[bitcoinvsalts]

It does not work with iOs either

[chaitanya-bhagavan]

@auser I too encountered this issue and after debugging I found that the orderByChild is passed to firebase and the response is indeed sorted on the key specified. The order is getting lost in FirestackUtils.castSnapshotValue. Seems like WritableMap does not maintain the order of insertion.

[auser]

Oh yes. I added a map and for each function on snapshot to retain the order