Hilt field injection in the super Fragment or ViewModel

I'm using Dagger-Hilt for dependency injection in my Android project, now I have this situation where I have a base abstract Fragment

BaseFragment.kt

abstract class BaseViewModel constructor(
    val api: FakeApi,
) : ViewModel() {
    
    //...
    
}

Here, I have a dependency which is FakeApi. What I'm trying to do is to inject the FakeApi into the BaseViewModel to be available in the BaseViewModel and all its children.

• The first approach I tried is using the constructor injection and inject it to the child and pass it to the super using the constructor.

TaskViewModel.kt

@HiltViewModel
class TaskViewModel @Inject constructor(
    api: FakeApi
) : BaseViewModel(api){

}

This approach works fine, but I don't need to pass the dependency from the child to the super class, I need the FakeApi to be automatically injected in the BaseViewModel without having to pass it as I have three levels of abstraction (There is another class inheriting from the TaskViewModel) So I have to pass it two times.

• The second approach was to use the field injection as follows

BaseViewModel.kt

abstract class BaseViewModel: ViewModel() {
    @Inject
    lateinit var api: FakeApi
    //...
}

TaskViewModel.kt

@HiltViewModel
class TaskViewModel @Inject constructor(): BaseViewModel() {
    
}

This approach didn't work for me and the FakeApi wasn't injected and I've got an Exception

kotlin.UninitializedPropertyAccessException: lateinit property api has not been initialized

My questions are

• Why field injection doesn't work for me?
• Is there any way to use constructor injection for the super class instead of passing the dependency from the child?

from Hilt field injection in the super Fragment or ViewModel