lateinit property mUserViewModel has not been initialized - android-studio

Question

I´m trying to read my database, therefore i have created an editext where I will enter a username and a button that allows me to search for the user, but I am presenting an the error in class ListFragment : Fragment(), which says lateinit property mUserViewModel has not been initialized,please help me :(.
//Entity
#Entity(tableName = "user_table")
data class User(
#PrimaryKey(autoGenerate = true)
val id: Int,
val firstName: String,
val lastName: String,
val age: Int
)
//Dao
#Dao
interface UserDao {
#Insert(onConflict = OnConflictStrategy.IGNORE)
suspend fun addUser(user: User)
#Query("SELECT * FROM user_table where firstName LIKE :search LIMIT 1")
suspend fun readAllData(search : String) : User
}
//UserRepository
class UserRepository(private val userDao: UserDao) {
suspend fun readAllData(user: String):User{
return userDao.readAllData(user)
}
}
//UserViewModel
class UserViewModel(application: Application): AndroidViewModel(application) {
private lateinit var repository:UserRepository
fun search( search : String):User{
viewModelScope.launch {
repository.readAllData(search)
}
return search(String())
}
}
}
//class
class ListFragment : Fragment() {
//erro(lateinit property mUserViewModel has not been initialized)
lateinit var mUserViewModel:UserViewModel
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
val view = inflater.inflate(R.layout.fragment_list, container, false)
val name = view.editTextTextNameee.text.toString()
val prueba = mUserViewModel.search(name)
if (prueba!=null){
textView1.text = prueba.firstName
textView2.text = prueba.lastName
textView3.text = prueba.age.toString()
}else {
Toast.makeText(context, " Unregistered use", Toast.LENGTH_SHORT).show()
}
view.floatingActionButton.setOnClickListener {
findNavController().navigate(R.id.action_listFragment_to_addFragment)
}
return view
}
}

Answer 1

The reason for the lateinit not initialized property is you haven't created the ViewModel instance. can u try this
viewModel = ViewModelProvider(requireParentFragment(), factory).get(UserViewModel::class.java)
// factory will be the instance of the View Model
you can observe the livedata changes the onviewCreated()

Answer 2

It's normal because your Dao return a LiveData<List> so when you observe this data the return value is a List and not only a User. I don't know what you want to do. But you have to :
mUserViewModel.searchResult.observe(viewLifecycleOwner, Observer {
textViewName.text = it.name
textViewLastName.text = it.lastname
textViewAge.text = it.age
})
And your query will be :
#Query("SELECT * FROM user_table where name LIKE :search LIMIT 1")
suspend fun searchUser(search : String) : User
And in your mUserViewModel create a value searchResult and a method search:
fun search(val search : String){
viewModelScope.launch {
searchResult.postValue(dao.searchUser(search))
}
}