Flutter Firebase Database wrong timestamp order

Question

I\'m trying to set timestamp into firebase realtime database but when I retrieve, not ordering by timestamp. I did like so.

FirebaseDatabase.instance.referen         


        

Answer 1

The data is retrieved in the right order into a DataSnapshot. But when you call snap.value the information from the snapshot has to be converted into a Map<String, Object>, which not longer can hold information about the order of the child nodes.

To maintain the order, you have to process the child nodes from the DataSnapshot with a loop. I'm not an expert in Flutter (at all), but I can't quickly find a way to do this for a value event. So you might want to instead listen for .childAdded:

   FirebaseDatabase.instance
        .reference()
        .child('path')
        .orderByChild('timestamp')
        .onChildAdded
        .listen((Event event) {
      print(event.snapshot.value);
    })