Observing LiveData from ViewModel

Question

I have a separate class in which I handle data fetching (specifically Firebase) and I usually return LiveData objects from it and update them asynchronously. Now I want to have

Answer 1

Use Flow

The guideline in docs is misunderstood

However ViewModel objects must never observe changes to lifecycle-aware observables, such as LiveData objects.

In this Github issue, he describes that the situations that be applied the above rule are that observed lifecycle-aware observables are hosted by another lifecycle scope. There is no problem that observes LiveData in ViewModel contains observed LiveData.

Use Flow

class MyViewModel : ViewModel() {
    private val myLiveData = MutableLiveData(1)

    init {
        viewModelScope.launch {
            myLiveData.asFlow().collect {
                // Do Something
            }
        }
    }
}

Use StateFlow

class MyViewModel : ViewModel() {
    private val myFlow = MutableStateFlow(1)
    private val myLiveData = myFlow.asLiveData(viewModelScope.coroutineContext)
}

PS

The asFlow makes a flow that makes LiveData activate at starting collect. I think the solution with MediatorLiveData or Transformations and attaching a dummy observer doesn't have differences using the Flow except for emitting value from LiveData is always observed in the ViewModel instance.