Flutter provider consumer removes my items - flutter

Question

I'm trying to build a sort function in order to sort JSON data.
For this, I have a button that opens a "showModalBottomSheet".
Within it I can choose the following data of the school class numbers.
So in my data I have 6 classrooms when loading in my constructor.
My filter is represented by buttons which are active or not if the filter contains the number of the classroom. My code works pretty much, my problem is that when I select a filter button in order to activate or not the filter, the button is deleted instead of staying but changing color
My notifier :
class TablesNotifier with ChangeNotifier {
// Services
// ---------------------------------------------------------------------------
final jsonSelectorService = locator<JsonSelectorService>();
// Variables
// ---------------------------------------------------------------------------
//all data from my classerooms in JSON
List<ClassroomModel> classrooms;
// Data that I will display and reconstruct based on my filter parameters
List<ClassroomModel> classroomsFiltered;
List<int> numberOfClassrooms = List();
// Model which will store the parameters of my filters and as a function I will load the data to display
FilterClassroomsModel filterClassroomsModel = FilterClassroomsModel();
// Constructor
// ---------------------------------------------------------------------------
TablesNotifier(){
_initialise();
}
// Initialisation
// ---------------------------------------------------------------------------
Future _initialise() async{
classrooms = await jsonSelectorService.classrooms('data');
classroomsFiltered = classrooms ;
// I install the number of existing classrooms
// Here the result is [1,2,3,4,5,6]
classrooms.forEach((element) {
if(!numberOfClassrooms.contains(element.type)){
numberOfClassrooms.add(element.type);
}
});
// I install the number of classrooms activated by default in my filter
// As I decide to display all my classrooms by default
// My filter on the classrooms must contain all the loaded classrooms
filterClassroomsModel.classrooms = numberOfClassrooms;
notifyListeners();
}
// Functions public
// ---------------------------------------------------------------------------
void saveClassroomsSelected(int index)
{
// Here my classroom model also contains the numbers of the classrooms that I want to filter
if(filterClassroomsModel.classrooms.contains(index)){
filterClassroomsModel.classrooms.remove(index);
}else{
filterClassroomsModel.classrooms.add(index);
}
notifyListeners();
}
}
I have identified that in my function initialize () if I change my code by this it works :
filterClassroomsModel.classrooms= numberOfClassrooms; // this
filterClassroomsModel.classrooms= [1,2,3,4,5,6]; // By this
I am losing the dynamic side of my classroom calculation and that does not suit me. But I don't understand this behavior.
My view :
class TableScreen extends StatelessWidget {
final String title;
TableScreen({Key key, #required this.title}) : super(key: key);
#override
Widget build(BuildContext context) {
return Scaffold(
drawer: MenuDrawerComponent.builder(context),
appBar: AppBar(
backgroundColor: AppColors.backgroundDark,
elevation: 0,
centerTitle: true,
title: Text(title),
),
floatingActionButton: FloatingActionButton.extended(
icon: Icon(Icons.sort),
label: Text('Filter'),
onPressed: () async{
slideSheet(context);
},
backgroundColor: AppColors.contrastPrimary,
),
body: _buildBody(context),
);
}
Widget _buildBody(BuildContext context)
{
var _tableProvider = Provider.of<TablesNotifier>(context);
if(_tableProvider.chargesFiltered == null){
return Center(
child: CircularProgressIndicator(
backgroundColor: AppColors.colorShadowLight,
),
);
}else{
return Column(
children: <Widget>[
Expanded(
child: Container(
padding: EdgeInsets.only(top: 10, right : 20, left : 20),
child: ListView.builder(
itemCount: _tableProvider.classroomsFiltered.length,
itemBuilder: (context, index){
return Container(
child: Column(
children: [
Row(
// Some classrooms data
),
],
),
);
},
),
)
),
],
);
}
}
void slideSheet(BuildContext context) {
var _tableProvider = Provider.of<TablesNotifier>(context, listen:false);
showModalBottomSheet(
context: context,
isScrollControlled: true,
isDismissible: true,
builder: (context) {
return Wrap(
children: [
Container(
color: Color(0xFF737373),
child: Container(
child: Column(
children: <Widget>[
// Some filters ...
// Here I want to rebuild the list of button for show the changes
ChangeNotifierProvider.value(
value: _tableProvider,
child: Consumer<TablesNotifier>(
builder: (context, model, child){
return _listOfClassrooms(context);
}
),
),
],
),
),
),
]
);
});
}
Widget _listOfClassrooms(BuildContext context){
var _tableProvider = Provider.of<TablesNotifier>(context);
List<Widget> list = List<Widget>();
var listClassrooms = _tableProvider.numberOfClassrooms;
var filterClassrooms = _tableProvider.filterClassroomsModel.classrooms;
for (var i = 0; i < listClassrooms.length; i++) {
int selectIndex = 0;
if(filterClassrooms.contains(listClassrooms[i])){
selectIndex = listClassrooms[i];
}
list.add(
RadioComponent(
text: "${listClassrooms[i]}",
index: listClassrooms[i],
width: (MediaQuery.of(context).size.width - 56) /3,
selectedIndex: selectIndex,
onPressed: _tableProvider.saveChargesSelected,
),
);
}
return Wrap(
spacing: 8.0, // gap between adjacent chips
runSpacing: 8.0, // gap between lines
children: list
);
}
}
My FilterClassroomsModel :
class FilterClassroomsModel {
int order;
int sort;
List<int> classrooms;
FilterClassroomsModel ({
this.order = 0,
this.sort = 0,
this.classrooms = const[],
});
#override
String toString() {
return '{ '
'${this.order}, '
'${this.sort}, '
'${this.classrooms}, '
'}';
}
}
EDIT : Resolved topic. Thanks to Javachipper.
In the notifier I replace that :
filterClassroomsModel.classrooms = numberOfClassrooms;
By that :
filter.classrooms = List<int>();
filter.classrooms.addAll(numberOfClassrooms);

Answer 1

change this:
filterClassroomsModel.classrooms = numberOfClassrooms;
to:
filterClassroomsModel.classrooms.addAll(numberOfClassrooms);
Update (you can also do it like this):
filterClassroomsModel.classrooms= new List<int>();
filterClassroomsModel.classrooms.addAll(numberOfClassrooms);