Flutter: In RiverPod , how to alter state model's variables directly? - flutter

Question

I am currently learning River Pod and also new to flutter.
When setting new state in StateNotifer , I need to create a new model and replace the state
But directly changing is not working
class CounterModel {
CounterModel(this.count, this.age);
int count;
int age;
}
class CounterNotifier extends StateNotifier<CounterModel> {
CounterNotifier() : super(_initialValue);
static CounterModel _initialValue = CounterModel(0,18);
void increment() {
// state.count = state.count + 1; // not working, but need like this !
state = CounterModel(state.count + 1, state.age); // working
}
}
In the above code , when I trying to change the count variable directly like, state.count = state.count + 1 , nothing changed
But when reinitialising the state by creating a new model like state = CounterModel(state.count + 1, state.age)
Its seems to be state model variables are immutable and needs to be recreated on every alteration !
My question is , what if the CounterModel have 50 variables , then I have to do something like
state = CounterModel (var1,var2,......,var49,var50) ;
So , is it possible to directly change the variables like
state.var1 = new_value1;
state.var2 = new_value2;
....
state.var50 = new_value50;

Answer 1

You have to always reassign the state in StateNotifier for Consumers to see the changes hence, state.var1 = new_value1; can't work with StateNotifier
If You're very keen about that syntax, use ChangeNotifier since it allows you change individual properties of the class but you must call notifyListeners
Like so:
class CounterNotifier extends StateNotifier {
static CounterModel value = CounterModel(0,18);
void increment() {
value.count = value.count + 1;
notifyListeners();
}
}
If You want to stick with StateNotifier and don't want to write boilerplate code, create a copyWith method on the model.
Like so:
class CounterModel {
CounterModel(this.count, this.age);
int count;
int age;
CounterModel copyWith({int? count, int? age}){
return CounterModel(
count ?? this.count,
age ?? this.age
);
}
}
Then you can keep reassigning with it like so:
class CounterNotifier extends StateNotifier<CounterModel> {
CounterNotifier() : super(_initialValue);
static CounterModel _initialValue = CounterModel(0,18);
void increment() {
state = state.copyWith(count: state.count + 1);
}
}