Distributed Counter is not creating counter shards all the time

[sumanc]

Hi,

I followed the docs snd setup a distributed counter in one of my collections. I have this rule:

match /databases/{database}/documents/messages/{page} {
    // Allow to increment only the 'count' field and only by 1.
    match /_counter_shards_/{shardId} {
      allow get;
      allow write: if request.resource.data.keys() == ["count"]
                     && (resource == null || request.resource.data.count ==
                     resource.data.count + 1);
    }
}

In my client app (iOS swift), I created this instance:

func increment {
            var db = Firestore.firestore()

            // create reference to the collection and the document you wish to use
            var doc = db.collection("messages").document("_counts_document_")
            let instance = FirebaseDistributedCounter(docRef: doc, field: "count")
            instance.increment(by: 1.0)
}

I set the Frequency for controllerCore function to be run to 5 mins.

But whenever I call increment once or in a loop for 10 times, counts_document.count is incrementing in realtime. Extension is not creating the sub-collections and the controllerCore function is not doing anything because there are no sub-collections. I saw them created once or twice but not more than that.

Please let me know if I am missing anything.

Thank you in advance,

--Suman