MainViewModel.kt

@UiThread
fun getUsers(context: Context): LiveData<List<User>> {
    if (!::users.isInitialized) {
        users = MutableLiveData()
        users.postValue(MyDatabase.get(context).users().getAll())
        GlobalScope.launch(Dispatchers.Main) {
            val usersFromDb: List<User> = async(Dispatchers.IO) {
                return@async MyDatabase.get(context).users().getAll()
            }.await()
            users.value = usersFromDb
        }
    }
    return users
}