override fun onFirstViewAttach() {
        super.onFirstViewAttach()
        Flowable
            .combineLatest<List<AccreditationItem>, List<Event>, Pair<List<AccreditationItem>, List<Event>>>(
                repository.getAccreditations(),
                eventRepo.observeEvents(),
                BiFunction { accreditations, events ->
                    Pair(accreditations, events)
                }
            )
            .map { pair ->
                val accreditations = pair.first
                val events = pair.second
                events.mapNotNull { event ->
                    val eventAccreditation = accreditations.firstOrNull { it.eventId == event.eventId }
                    event.name?.let { eventAccreditation?.barcode?.let { it1 -> EventAccreditation(it, it1) } }
                }
            }
            .observeOn(schedulers.ui())
            .subscribeOn(schedulers.io())
            .subscribe({
                if (!it.isNullOrEmpty())
                    viewState.loadData(it)
                else
                    throw Throwable()
            }, {
                viewState.onError()
            })
            .untilDestroy()
    }