Initially I was doing a

map

on the originalStateFlow but realized I wouldn’t be able to start a new flow inside it and emit those values whenever they come in, map needed a value directly or at least from a suspending function. I found out

transformLatest

exists and it was the only thing that I managed to do to get it compiling properly.

val viewState = originalStateFlow.transformLatest { uuidResult: Result<UUID> ->
    when(uuidResult) {
        Error -> emit(ViewState.Error)
        Success -> {
            val uuid = uuidResult.value
            startSomeOtherSubscription(uuid).collect { subscriptionResult -> // [1] See below for a question
                when(subscriptionResult) {
                    Error -> emit(ViewState.Content(uuid = uuid, extraData = null))
                    Success -> {
                        val extraData = extraDataSupendingApiCall(subscriptionResult.value)
                        emit(ViewState.Content(uuid = uuid, extraData = extraData))
                    }
                }
            }
        }
    }
}.stateIn(
    scope = viewModelScope,
    started = SharingStarted.WhileSubscribed(5000),
    initialValue = ViewState.Loading,
)

Now I wonder: 1. This

collect

inside the flow transformation feels a bit awkward no? Will it work just fine since we’re doing

transformLatest

anyway, meaning that it would be cancelled in case we get a new uuidResult? If I just did

transform

without

latest

would it keep this flow alive forever (or maybe until viewModelScope is cancelled since it’s launched there with

StateIn

) and be a problem? 2. Is doing such a whole new collect flow inside this transform context something that is safe to do? 3. Is there a better way to model this entirely? It feels a bit awkward the way that I’ve done it, and I am not sure it’s because I am not used to this, the requirement of what I am doing is just weird itself or if I am just plain out doing something wrong/suboptimal.

The only issue I see is that when you get a new UUID, you probably want to update your state to Loading.

Just guessing, maybe you want the old data there until you get the new data.