如何将 AsyncSnapshot 数据转换为 Map？

Question

I want to get some json data in my FutureBuilder but for some reason my code throws a
_TypeError (type '_JsonQuerySnapshot' is not a subtype of type 'Map<dynamic, dynamic>')
whenever I try to unpack the AsyncSnapshot into a Map.

FutureBuilder(
    future: getFiyat(),
    builder: (BuildContext context, AsyncSnapshot snapshot) {
        if (snapshot.hasData) {
            lists.clear();

            // type error is thrown here
            Map<dynamic, dynamic> values = snapshot.data;

            values.forEach((key, values) {
                lists.add(values);
            });
        }

        return ListView.builder();
    },
);

What am I doing wrong here?

Answer 1

You have your QuerySnapshot data and you should call data() on this snapshot, to get its content. In your case:

QuerySnapshot<Object?>? querySnapshot = snapshot.data;
Map<dynamic, dynamic> values = querySnapshot.data();