```I am new to kotlin flows and trying to add Flows to one of my project and facing an issue while c...

# flow

[Koya Sivaji]

I am new to kotlin flows and trying to add Flows to one of my project and facing an issue while converting list of objects of one type to another as shown below. Basically, am not sure which operator to be used for this.

//Repository - method return type is  Flow<List<HistoryEvent>>
fun getHistoryEvents(): Flow<List<HistoryEvent>>

//ViewModel - calling repository method and trying to convert data to List<AccessoryEvent>

val accessoryEvents : LiveData<List<AccessoryEvent>>=  liveData{
                                                      repository.getHistoryEvents()

                                                  // what operator to be used to convert from List<HistoryEvent> to List<AccessoryEvent>

                                                        .collect()
                                                      }

I tried like below

val eventHistory: LiveData<List<AccessoryEventType>> = 
        liveData {
            deviceRepository.getDeviceEventHistoryFor("abcd")
                .map { historyEvents ->
                    emit((historyEvents.map { AccessoryEventType.getEventType(it) }))
                }
                .collect()
        }

after this, all elements in the returned list are same and equals to the last emitted element. Am not sure what I am doing wrong

[Peter]

don’t know anything about android but why are you emit in your map ?

[Peter]

doesn’t getDeviceEventHistoryFor already return a flow ?

[Koya Sivaji]

to convert Flow<xx> to Livedata<xx>

[Peter]

also Flow<List<HistoryEvent>> seems like a smell

[Peter]

ah ok - no idea what LiveData is sorry

[Koya Sivaji]

ok..basically how to convert List of objects of one type to another. In my case, I have to convert List<HistoryEvents> to List<AccessoryEventType>

[Koya Sivaji]

getDeviceEventHistoryFor returns Flow<List<HistoryEvent>>

[Peter]

should be a very simple then: List<HE>.map { convertHEtoAET(it) }

[Peter]

ie. no emit

[Peter]

emit is used when creating a reactive publisher (a new flow)

[Koya Sivaji]

ok. lemme see how to convert to Livedata<xx> after doing map without emit