This gist is part of https://github.com/widiarifki/android-playground/tree/master/compose

ShoppingListViewModel.kt

class ShoppingListViewModel(
    private val repository: ShoppingItemRepository = ShoppingItemRepository()
) : ViewModel() {

    // variables that hold state
    var isLoading by mutableStateOf(true)
    val shoppingItems: LiveData<List<ShoppingItem>> = getItems()

    private fun getItems(): LiveData<List<ShoppingItem>> {
        isLoading = true
        return Transformations.map(repository.allShoppingItems) { items ->
            isLoading = false
            items
        }
    }

    // event: add item
    fun addItem(item: ShoppingItem) {
        viewModelScope.launch(Dispatchers.IO) {
            repository.insert(item)
        }
    }

    // event: delete item
    fun deleteItem(item: ShoppingItem) {
        viewModelScope.launch(Dispatchers.IO) {
            repository.delete(item)
        }
    }

    // event: tick/un-tick item
    fun toggleTickItem(item: ShoppingItem) {
        val updatedItem = item.copy(isTicked = !item.isTicked)
        viewModelScope.launch(Dispatchers.IO) {
            repository.update(updatedItem)
        }
    }
}