Got error bool flutter

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On this code, i try to create Delete features, which is can delete history/data that already added.

Here's the code :

menuOption(String value, History history) async {
   if (value == 'update') {
     Get.to(() => UpdateHistoryPage(
         date: history.date!, idHistory: history.idHistory!))?.then((value) {
       if (value ?? false) {
         refresh();
       }
     });
   } else if (value == 'delete') {
     bool yes = await DInfo.dialogConfirmation(
         context, 'Hapus', 'Yakin untuk menghapus history ini ?',
         textNo: 'Batal', textYes: 'Ya');
     if (yes) {
       bool success = await SourceHistory.delete(history.idHistory!);
       if (success) refresh();
     }
   }
 }

The error :

Error: A value of type 'bool?' can't be assigned to a variable of type 'bool' because 'bool?' is nullable and 'bool' isn't.
      bool yes = await DInfo.dialogConfirmation(

What I have tried:

Nothing i can do, so still error

Posted 15-Mar-23 19:12pm

Alva Rizky

Updated 15-Mar-23 19:42pm

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OriginalGriff · Answer 1 · 2023-03-15T19:42:00

Thee error message is pretty explicit: the function returns a nullable value - bool? - and you are trying to store it in a non-nullable type - bool; the types are not the same.

The simplest solutions are to change the type of yes to bool?, or change the return value of dialogConfirmation to bool

There are other ways, but they are more complicated: https://stackoverflow.com/questions/67246851/in-dart-given-the-nullable-type-t-how-do-i-get-the-non-nullable-one-t[^]