Add an another attribute to an existing List in Flutter - list

Question

I have been trying many ways to add an isChecked: false attribute to every list inside the _filterOptions List in my Flutter Project. I couldn't find any solution to this. If there is any solution I am happy to see it.
List<dynamic> _filters = [];
List<List<dynamic>> _filterOptions =[];
var filters =
await json.decode(data)["getProductsByStore"]["aggregations"];
for(int i = 0; i < filters.length; i++){
_filters.add(filters[i]["label"]);
_filterOptions.add(filters[i]["options"]);
}
//print(filters[0]["options"]);
//print(_filters);
print(_filterOptions);
I am getting this kind of nested list when printed and I want to add the attribute to every list.
as an example:
[[{count: 3, label: 30-40, value: 30_40, isChecked:false}], [{count: 2, label: Bagged , value: 50, isChecked:false},{...},{...}...]]

Answer 1

Create Model class with your data and bool isChecked
class ModelClass{
String? label;
int? count;
List? options;
bool? isChecked;
ModelClass({this.label, this.count , this.options, this.isChecked = false});
ModelClass.fromJson(Map<String, dynamic> json){
label = json['label'];
count = json['count'];
options = json['options'];
}
}
then you can add data like below code
List<ModelClass> list = [];
void function()async{
List<dynamic> _filters = [];
List<List<dynamic>?> _filterOptions =[];
var filters =
await json.decode(data)["getProductsByStore"]["aggregations"];
for(int i = 0; i < filters.length; i++){
ModelClass modelClass = ModelClass.fromJson(filters[i]);
list.add(modelClass);
_filters.add(modelClass.label);
_filterOptions.add(modelClass.options);
}
print(list[0].options);
print(list[0].isChecked);
}
if you want to modify isChecked for some specific index
list[0].isChecked = false;

Answer 2

Just add these lines.
class YourWrapperClass {
YourWrapperClass({this.filterOptions = const [], this.isChecked = false});
List<List<dynamic>> filterOptions;
bool isChecked;
}
YourWrapperClass filterWrapper = YourWrapperClass(filterOptions: _filterOptions, isChecked: false);
And use this wrapper class object whenever ya need to access _filterOptions.
But, I would more rather recommend using the WrapperClass on the list elements, like so.
class YourWrapperClass {
YourWrapperClass({this.filterOption = const [], this.filter="", this.isChecked = false});
List<dynamic> filterOption;
dynamic filter;
bool isChecked;
}
List<YourWrapperClass> list = [];
var filters =
await json.decode(data)["getProductsByStore"]["aggregations"];
for(int i = 0; i < filters.length; i++){
list.add(YourWrapperClass(filterOption:filters[i]["options"], filter:filters[i]["label"], isChecked=false));
_filterOptions.add(filters[i]["options"]);
}