Passing arguments to ViewModel with AssistedInject.

UserDetailViewModel.kt

class UserDetailViewModel @AssistedInject constructor(
    private val userRepository: UserRepository,
    @Assisted private val userId: Int
) : ViewModel() {
 
    private val reloadTrigger = MutableLiveData<Boolean>()
    private val userDetail: LiveData<UserDetailModel> = Transformations.switchMap(reloadTrigger) {
        userRepository.getUserDetail(userId.toString(), reloadTrigger.value!!)
    }
 
    init {
        refreshUserDetail()
    }
 
    fun getUserDetail(): LiveData<UserDetailModel> = userDetail
 
    fun refreshUserDetail(forceRefresh: Boolean = false) {
        reloadTrigger.value = forceRefresh
    }
 
    @AssistedInject.Factory
    interface Factory {
        fun create(userId: Int): UserDetailViewModel
    }
}