How can I use a future list of object from database to trigger rebuild using flutter provider?

Question

class StudentProvider extends ChangeNotifier {
DataBaseHelper data = DataBaseHelper();
List<StudentModel>? student = [];
List<StudentModel>? searchStudentList;
Future<List<StudentModel>> getStudentList() async {
student = await data.getStudent();
return student!;
}

void insert(StudentModel studentModel) async {
print("reached insert in provider class");
await data.insertStudent(studentModel);
notifyListeners();
}
}

The code above is the provider class of mine and I want to use the list that I get from getStudentList list method to build widgets. The problem is it returns a future because I am getting the data from the database.

  body: TabBarView(children: [
          Consumer<StudentProvider>(
              builder: (context, StudentProvider student, ch) {
            print("rebuild happened");
            return ListView(
              children: [
                ...student.getStudentList().map((e) {
                  return HomeScreen(student: e);
                }).toList(),
              ],
            );
          }),

This is where I am trying to build widgets. I am unable to do so.

Answer 1

in getStudentList() you have used  Future<List<StudentModel>> so that future can not access in listview.

> So please use streambuilder or remove the future from the list



 class StreamBuilderUsage extends StatelessWidget {
      @override
      Widget build(BuildContext context) {
        return Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            crossAxisAlignment: CrossAxisAlignment.center,
            children: <Widget>[
              Expanded(
                child: Center(
                  child: Consumer<StudentProvider>(
                      builder: (context, StudentProvider student, ch) {
                      return StreamBuilder(
                        stream: student.getStudentList().asStream(),
                        builder: (context, snapshot){
                          print(snapshot.connectionState);
                          if(snapshot.hasData){
                            var data = snapshot.data as List<String>;
                            return ListView.builder(
                              itemCount: data.length,
                              itemBuilder: (context, index){
                                return Text(data[index]);
                              },
                            );
                          }else{
                            return CircularProgressIndicator();
                          }
                        },
                      );
                    }
                  ),
                ),
              ),
            ],
          ),
        );
      }
    }