what happens to `myNav` object, in case both `mode...

# compose

[Daniele B]

what happens to myNav object, in case both model and navController are immutable?
will it get instantiated new at each recomposition?

@Composable
fun Navigation(model : MyModel) {
   val appState by model.stateFlow.collectAsState()
   ...
   val navController = rememberNavController()
   val myNav = MyNav(model, navController)
   ...
}

[Slava Glushenkov]

Seems rememberNavController is @Composable function and take care of recomposition.

[Chachako]

Yep it will be recreated on each recombination, to avoid this you should do:
remember(model, navController) { MyNav(model, navController) }

[Daniele B]

thanks @Chachako!
should it be remember or rememberSaveable ?

[Chachako]

Use rememberSaveable when your instance wants to be retained after a configuration change.

Reference:
https://developer.android.com/jetpack/compose/state#restore-ui-state

[Daniele B]

it seems to work with remember , but not with rememberSaveable :

MyNav cannot be saved using the current SaveableStateRegistry. The default implementation only supports types which can be stored inside the Bundle. Please consider implementing a custom Saver for this class and pass it to rememberSaveable().

[Chachako]

Yep, as the error stated, you need to create a custom Saver for MyNav