Flutter setState list isnt updating Listviewbuilder - flutter

Question

I have a simple list and I am filter the list by date range picker. All is working fine its showing result also that list is filter success but on ListView builer its showing this error.
Class 'WhereIterable<Object>' has no instance method '[]'.
My code
Future<List> getCustomerList() async {
print(widget.data);
// print('check running');
final storage = new FlutterSecureStorage();
String uUid = await storage.read(key: "uUid");
CollectionReference _collectionRef =
FirebaseFirestore.instance.collection('Transaction');
QuerySnapshot querySnapshot = await _collectionRef.get();
// Get data from docs and convert map to List
List allData = querySnapshot.docs
.where((element) => element['CustomerID'] == widget.data['customerID'])
.map((doc) => doc.data())
.toList();
print(allData);
restore = allData;
backrestore = allData;
setState(() {
show = true;
});
}
Padding(
padding: const EdgeInsets.all(8.0),
child: GestureDetector(
onTap: () async {
final List<DateTime> picked =
await DateRangePicker.showDatePicker(
context: context,
initialFirstDate: new DateTime.now(),
initialLastDate: (new DateTime.now())
.add(new Duration(days: 6)),
firstDate: new DateTime(2015),
lastDate:
new DateTime(DateTime.now().year + 2));
if (picked != null && picked.length == 2) {
print(picked);
selectedDate = picked[0];
DateTime endDate = picked[1];
List<DateTime> days = [];
var filterData = backrestore;
DateTime date = DateTime.parse(
filterData[0]['lastupdate'].toDate().toString());
print(date);
for (int i = 0;
i <= endDate.difference(selectedDate).inDays;
i++) {
days.add(selectedDate.add(Duration(days: i)));
}
print(days);
final filteredItemsToAdd = filterData.where((item) =>
days.contains(DateTime.parse(
item['lastupdate'].toDate().toString())));
print(filteredItemsToAdd.length);
print(filteredItemsToAdd);
setState(() {
restore = filteredItemsToAdd;
});
}
},
child: Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(10),
color: Color(0xffE5E7E9)
),child: Padding(
padding: const EdgeInsets.all(13.0),
child: Text('Date'),
))),
),
Container(
height: Height * 0.5,
child: ListView.builder(
shrinkWrap: true,
itemCount: restore.length,
itemBuilder: (BuildContext context, int index) {
DateTime date = DateTime.parse(
restore[index]['lastupdate'].toDate().toString());
// print(DateFormat('dd-MMM-yyy').format(date)); // prints 2019-04-16
// print('List length ${snapshot.data.length}');
return Padding(
padding: const EdgeInsets.only(left: 13, right: 13),
child: Container(
decoration: BoxDecoration(
border: Border(
top: BorderSide(color: Colors.grey, width: .5)),
),
child: Padding(
padding: const EdgeInsets.all(13.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Text(
DateFormat('dd MMM yyy').format(date).toString(),
style: TextStyle(fontFamily: 'PoppinsMedium'),
),
Row(
children: [
Text(
restore[index]['give'].toString(),
style: TextStyle(
fontFamily: 'PoppinsMedium',
color: Colors.green),
),
SizedBox(
width: 60,
),
Text(
restore[index]['take'].toString(),
style: TextStyle(
fontFamily: 'PoppinsMedium',
color: Colors.red),
),
],
)
],
),
),
),
);
},
),
),
You can see I am fetching list then saving on object. And on DateRange picker I am changing the new value by setState but dont know why its showing this error.

Answer 1

I believe this code causes the problem
List allData = querySnapshot.docs
.where((element) => element['CustomerID'] == widget.data['customerID'])
.map((doc) => doc.data())
.toList();
element has type QueryDocumentSnapshot. Replace element['CustomerID'] by element.data()['customID'].