Does Index Streaming work this way?

Help
,
1

Hi,

I have been working on index streaming. I have an index like this.

{
  name: "CheckNotification",
  unique: false,
  serialized: true,
  source: "Notification",
  terms: [
    {
      field: ["data", "isRead"]
    }
  ]
}

I want to show unread notifications to the users. I have created a query whose isRead value is false.

 final stream = faunaClient.setStream(Match(Index("CheckNotification"), terms: [false]), {});

When I create a document in the Notification Collection, I can get event streaming. There is no problem here.
But If I delete this document and create a new one, I’ll get the deleted document as well.

flutter: {"title":"Notif. 1","isRead":false}
flutter: -------------------
flutter: {"title":"Notif. 1","isRead":false} -- This one was deleted
flutter: {"title":"Notif. 2","isRead":false}
flutter: -------------------

Why am I getting deleted documents? Is this normal?

2

Hi @hasimyerlikaya, yes this is normal.

The Index contains the Set of all Documents that match the terms provided. When you delete a Document, it must be removed from the Index.

3

In this case, I have to check every document because I can’t be sure if it’s deleted or not. I would expect to get only the available documents somehow.

Thank you.

4

Every event contains the action that triggered the event. For Set (Index) streams, the possible actions are add and remove. You can read about streaming events in our documentation here: Event streaming - Fauna Documentation

You may still need to do something to differentiate between remove because the document was updated or because it was deleted.

5

I would expect that, but here is the problem:
When I delete a document, the stream is not working. I don’t know if this problem is caused by the Dart package that I’m using. I can only handle creating events.
When streams work after creation, stream data contains deleted documents as well.