viewModel.dataEvents.observe(viewLifecycleOwner, Observer { showSnackbar() })
viewModel.deleteEntry()

val dataEvents: LiveData<EntryListEvent> = Transformations.switchMap(repository.events, ::handleRepoEvent)
fun deleteEntry() = repository.deleteEntry()
private fun handleRepoEvent(event: RepositoryEvent): LiveData<EntryListEvent> {
    // convert the repository event to an UI event
}

private val _events = MutableLiveData<RepositoryEvent>()
val events: LiveData<RepositoryEvent>
    get() = _events

fun deleteEntry() {
    // delete it from database
    _events.postValue(RepositoryEvent.OnDeleteSuccess)
}