How can we use saveStateHandle in viewModel via co...

# koin

[Ankit Kumar]

How can we use saveStateHandle in viewModel via compose
or if not supported directly how can we get instance of saveStateHandle and pass it as parameter ?

[arnaud.giuliani]

saveStateHandle is a regular parameter that is detected by Koin. Just use it in your constructor

[Ankit Kumar]

how should I provide the dependency while defining module ?

viewModel {  LoginViewModel(savedStateHandle = get(), get()) }

[Pedro Francisco de Sousa Neto]

I think it's like:

viewModel {  LoginViewModel() }

Right @arnaud.giuliani?

[arnaud.giuliani]

yes, just viewModel { LoginViewModel(savedStateHandle = get(), get()) }

[arnaud.giuliani]

@Pedro Francisco de Sousa Neto missing get() here 🙂

[Ankit Kumar]

not working it's crashing

creating viewmodel instance like this val viewModel: LoginViewModel = getViewModel()

[Ankit Kumar]

do I need to use any different method to create?

[arnaud.giuliani]

from where do you call it?

[Ankit Kumar]

is there anything wrong

[arnaud.giuliani]

use koinViewModel instead of getViewModel but should'n change much

[arnaud.giuliani]

what is the stack trace?

[Ankit Kumar]

NoBeanDefFoundException

Untitled

[Ankit Kumar]

org.koin.core.error.NoBeanDefFoundException: |- No definition found for class:'androidx.lifecycle.SavedStateHandle'. Check your definitions!

[Ankit Kumar]

same with koinViewModel ,if I see correctly internally it is using getViewModel only

[arnaud.giuliani]

yep

[Ankit Kumar]

I created a helper is it fine, bcz now I am invoking parameters early, will lead to issues / performance loss?

@OptIn(KoinInternalApi::class)
@Composable
inline fun <reified T : ViewModel> NavController.getViewModel(
    qualifier: Qualifier? = null,
    owner: ViewModelStoreOwner = checkNotNull(LocalViewModelStoreOwner.current) {
        "No ViewModelStoreOwner was provided via LocalViewModelStoreOwner"
    },
    scope: Scope = GlobalContext.get().scopeRegistry.rootScope,
    noinline parameters: ParametersDefinition? = null
): T {
    val params = remember(parameters) {
        parameters?.invoke()?.values?.toTypedArray()
    }
    val savedStateHandle = currentBackStackEntry?.savedStateHandle

    return org.koin.androidx.compose.getViewModel(
        qualifier = qualifier,
        owner = owner,
        scope = scope,
        parameters = {
            if (params != null) {
                parametersOf(
                    savedStateHandle,
                    *params
                )
            } else {
                parametersOf(savedStateHandle)
            }
        }
    )
}

[arnaud.giuliani]

koinNavViewModel is doing the same I believe 🤔

[Ankit Kumar]

I don't see koinNavViewModel anywhere even in koin doc
or is there any another dependency I need?