Changing query parameters for observeEventType in iOS

[arpit goel]

Hi

I am trying to do the following sync with my firebase server for (only) updates. So I want to send the timestamp of the last update and only request the new updates from the server using observeEventType.

So I do the following:

            [[[self.myRootRef queryOrderedByChild:@"timestamp"] queryStartingAtValue:timestamp] observeEventType:FEventTypeValue withBlock:^(FDataSnapshot *snapshot) {

                       timestamp = snapshot.timestamp;

            }];

This clearly doesn't work. The timestamp is updated but the new timestamp is not used as a query parameter. I was wondering if there's a way to change the query inside the block, or if there's some other way to achieve this? Any help would be greatly appreciated. Thanks!

[Frank van Puffelen]

As far as I know queries are immutable, you can only specify their parameters when you initially create them. So you'll have to stop the listeners on the current query and create a new query when the timestamp changes.