Pass argument through public setter method

UserDetailViewModel.kt

class UserDetailViewModel @Inject constructor(
    private val userRepository: UserRepository
) : ViewModel() {
 
    private lateinit var userId: String
    private val reloadTrigger = MutableLiveData<Boolean>()
    private val userDetail: LiveData<UserDetailModel> = Transformations.switchMap(reloadTrigger) {
        userRepository.getUserDetail(userId, reloadTrigger.value!!)
    }
 
    // Passing our argument through a public setter method
    fun setUserId(userId: String) {
        this.userId = userId
        refreshUserDetail()
    }
 
    fun getUserDetail(): LiveData<UserDetailModel> = userDetail
 
    fun refreshUserDetail(forceRefresh: Boolean = false) {
        reloadTrigger.value = forceRefresh
    }
}