Flutter ViewModel old data is repopulating (using Provider)

Question

I'm using multiProvider to manage state in flutter. The main problem that i'm facing is; Unable to clear the data inside my viewModel after closing a page. When i open the page again, old data is populating from viewModel.

Because of this issue i've created a 'reset' method in my viewModel & calling this 'reset' method before open the page.

Is there any way to remove old values from viewModel:- Please suggest

My code:

Main Page Adding providers under multi provider

class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MultiProvider(
  providers: [
      ChangeNotifierProvider.value(value: ViewModel1()),
      ChangeNotifierProvider.value(value: ViewModel2()),
    ],
  child: MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
      ),
      //Set Home Page after splash
      home: HomePage(),
    ));
   );
   }
   }

This is my Homepage Navigate to FirstPage & reset ViewModel1 data

 HomePage()
   {
   :
   :
   :
   onPressed(){
     Navigator.push(
        context, MaterialPageRoute(builder: (context) => FirstPage()));
     Provider.of<ViewModel1>(context, listen: false).reset();
              }
  }

This is My Page

class FirstPage extends StatefulWidget {
 @override
 _FirstPageState createState() => _FirstPageState();
 }
class _FirstPageState extends State<FirstPage> {
 @override
 Widget build(BuildContext context) {
 final ViewModel1 _viewModel1 =
    Provider.of<ViewModel1>(context, listen: true);

   TextFormField(
        controller: _fNameController,
        onChanged: _viewModel1.setFname,
      )
      }
      }

This is my ViewModel

 class ViewModel1 with ChangeNotifier {
 String _fName = '';

 String get fName => _fName;

 setFname(String fName) {
 _fName = fName;
 notifyListeners();
 setFnameValidation(fName.trim().isNotEmpty ? true : false);
 }

   //TODO Reset all values
   void reset() 
   {
      _fName = '';
      notifyListeners();
   }
 }

   

Answer 1

If you are reusing one model on different pages, without sharing data between pages.. It's better to create and close the model on every page.