Android compose when updating data in the Room database, recomposition does not occur-CodePudding

I want to update the data in the database and display the updated data on the screen.But I can't do it. The update occurs only after restarting the application. What am I doing wrong?. Help please

fun list(model: MyViewModel = viewModel()) {

val list = model.listToDo.observeAsState(listOf()).value
val grouped = list.groupBy { it.isFinished }

LazyColumn(contentPadding = PaddingValues(vertical = 8.dp)
    , verticalArrangement = Arrangement.spacedBy(8.dp)
    , ){
    grouped.forEach { (initial, contactsForInitial) ->
        stickyHeader {
            Text(
                "Section $initial",
                Modifier
                    .fillMaxWidth()
                    .padding(8.dp)
            )
        }

        items(contactsForInitial) { contact     ->
            card(contact, model = model)
        }
    }
}
}

Function in viewmodel

fun update(task: ToDo){
    viewModelScope.launch(Dispatchers.IO) {
        repository.update(task)
    }
}

Function in the dao

 @Update
fun update(task: ToDo)

ViewModel

class MyViewModel : ViewModel() {

private val repository = Repository.get()
val listToDo = repository.getListToDo()


fun delete(task: ToDo){
   viewModelScope.launch(Dispatchers.IO) {
       repository.delete(task)
   }
}

fun insertToDo(task: ToDo){
    repository.insertToDo(task = task)
}


fun update(task: ToDo){
    viewModelScope.launch(Dispatchers.IO) {
        repository.update(task)
    }
}}

CodePudding user response：

You are not observing the state. I think this code: val list = model.listToDo.observeAsState(listOf()).value just takes a single snapshot of the flow. Try it like that: val list by model.listToDo.observeAsState(listOf())