Flutter and Firebase: Why is data not returned sorted by id?

Question

I am trying to return data from firestore database sorted by id. After updating one entry data is returned with one record out of sort. After updating a second entry to confirm issue data is again returned now with two records out of sort. Id is a number on the db and so should be in numeric order.

Here is the code:

  Future getKegIds() async {
    await FirebaseFirestore.instance.collection("kegs").orderBy("id", descending: false ).get().then(
          (snapshot) => snapshot.docs.forEach(
            (document) {
                  print(document.reference);
                  kegIds.add(document.reference.id);
            },
          ),
    );
  }

and here are the results:

• flutter: (kegs/keg:1)
• flutter: (kegs/keg:2)
• flutter: (kegs/keg:3)
• flutter: (kegs/keg:4)
• flutter: (kegs/keg:5)
• flutter: (kegs/keg:6)
• flutter: (kegs/keg:7)
• flutter: (kegs/keg:8)
• flutter: (kegs/keg:9)
• flutter: (kegs/keg:10)
• flutter: (kegs/keg:11)
• flutter: (kegs/keg:15)
• flutter: (kegs/keg:16)
• flutter: (kegs/keg:12)
• flutter: (kegs/keg:13)

Kegs 15 and 16 are out of order.

Answer 1

I think is something like orderBy(FieldPath.documentId) , orderBy('id') is order by a field in document call id .