I've a composable called ParentScreen and a ViewModel named ParentViewModel. Inside the ParentViewModel, I am collecting a value from my repo.

class MyRepo @Inject constructor() {
    fun getParentData() = System.currentTimeMillis().toString() // some dummy value
}

@HiltViewModel
class ParentViewModel @Inject constructor(
    myRepo: MyRepo
) : ViewModel() {
    private val _parentData = MutableStateFlow("")
    val parentData = _parentData.asStateFlow()

    init {
        val realData = myRepo.getParentData()
        _parentData.value = realData
    }
}

@Composable
fun ParentScreen(
    parentViewModel: ParentViewModel = hiltViewModel()
) {
    val parentData by parentViewModel.parentData.collectAsState()
    ChildWidget(parentData = parentData)
}

Inside the ParentScreen composable, I have a ChildWidget composable and it has its own ViewModel named ChildViewModel.

@HiltViewModel
class ChildViewModel @AssistedInject constructor(
    @Assisted val parentData: String
) : ViewModel() {

    @AssistedFactory
    interface ChildViewModelFactory {
        fun create(parentData: String): ChildViewModel
    }

    init {
        Timber.d("Child says data is $parentData ")
    }
}

@Composable
fun ChildWidget(
    parentData: String,
    childViewModel: ChildViewModel = hiltViewModel() // How do I supply assisted injection factory here?
) {
    // Code omitted
}

Now, I want to get parentData inside ChildViewModel's constructor.

Questions

• How do I supply ChildViewModelFactory to Navigation Compose's hiltViewModel method?
• If that's not possible, what would be the most suitable method to inject an object from the parent composable to the child composable's ViewModel? How about creating a lateinit property and init method like below?

@HiltViewModel
class ChildViewModel @Inject constructor(
) : ViewModel() {
    lateinit var parentData: Long

    fun init(parentData: Long){
        if(this::parentData.isInitialized) return
        this.parentData = parentData
    }
}