LiveData Transformation not getting triggered

Question

I subscribed to ids and search in the ui but i wasn't getting any results so i stepped through with the debugger and found out that the transformation is not getting triggered after the first time. So when i call setIds the first time ids gets updated but for every call after the first one the transformation won't trigger. Same goes for the search.

Any ideas what might possible go wrong?

class MyViewModel : ViewModel() {

    private val repository = Repository.sharedInstance

    var recentRadius: LiveData<List<RecentRadius>>?
    var recentRoute: LiveData<List<RecentRoute>>?

    init {
        recentRadius = repository.recentRadius()
        recentRoute = repository.recentRoute()
    }


    private val idsInput = MutableLiveData<String>()
    fun setIdsInput(textId: String) {
        idsInput.value = textId
    }

    val ids: LiveData<List<String>> = Transformations.switchMap(idsInput) { id ->
        repository.ids(id)
    }

    private val searchInput = MutableLiveData<Search>()
    fun setSearchInput(search: Search) {
        searchInput.value = search
    }


    val search: LiveData<SearchResult> = Transformations.switchMap(searchInput) { search ->
        when (search.type) {
            SearchType.ID -> repository.id(search)
            SearchType.RADIUS -> repository.radius(search)
            SearchType.ROUTE -> repository.route(search)
        }
    }
}

Answer 1

The most common reason why transformation don't get triggered is when there is no Observer observing it or the input LiveData is not getting changed.