I have a flow collection that I want to do a condition where if the list if empty to just return as there's no further work to be done.

my issue is that Android studio is tossing a nagging message at me

there is more than one label with such a name in this scope

I'm assuming it's upset because I'm doing a collect within a collect (see code below, it'll hopefully make sense why I'm doing that).

is there a way to relabel the collect so it knows which one I'm talking about, I didn't see anything on it.

Also I'm new to flow so if I'm doing this wrong, let me know the proper way as this seems valid as I need one flow for the other one.

viewModelScope.launch {
    companyDataStore.getFromDataStore()
        .catch { e ->
            _snackBar.value = e.message
        }.collect { company ->
            companyFeatures = company.features

            userClient.getGroupsByFeatures(companyFeatures)
                .catch { e ->
                    _snackBar.value = e.message
                }
            .collect { groupList ->
                if (groupList.data?.size == 0)
                {
                    return@collect
                }

                groups = groupList.data!!
                feedFilter.group = groups.firstOrNull()?.guid
            }
        }
}

CodePudding user response：

You can add labels to the collect blocks and use them with return statement:

.collect collectLabel2@ { 
            // ...
            return@collectLabel2
            
            // ...        
}

Here label collectLabel2 is added.

To eliminate multiple collect blocks you can try to use flatMapMerge or flatMapLatest function:

viewModelScope.launch {
    companyDataStore.getFromDataStore()
        .catch { e ->
            _snackBar.value = e.message
        }
        .flatMapMerge { company ->
            companyFeatures = company.features

            userClient.getGroupsByFeatures(companyFeatures)
                .catch { e ->
                    _snackBar.value = e.message
                }
        }
        .collect { groupList ->
            if (groupList.data?.size != 0) {
                    groups = groupList.data!!
                    feedFilter.group = groups.firstOrNull()?.guid
            }   
        }
}