PostDetailViewModel.kt

class PostDetailViewModel(

        application: Application,
        private var schedulerProvider: AppScheduler,
        private var postRepository: PostSource,
        private var commentRepository: CommentRepository

) : AndroidViewModel(application) {

    companion object {
        private val DELAY_LIKE_EVENT = 2_000L
    }

    private val compositeDisposable: CompositeDisposable = CompositeDisposable()

    val post = MutableLiveData<Post>()
    val postError = SingleLiveEvent<Throwable>()

    val commentList = MutableLiveData<List<Comment>>()
    val commentListError = SingleLiveEvent<Throwable>()

    fun updatePost(postId: Long) {
        compositeDisposable.add(postRepository
                .getPostById(postId)
                .observeOn(schedulerProvider.ui())
                .subscribe({ post.value = it }, { postError.value = it }))

    }

    fun updateComment(postId: Long) {
        compositeDisposable.add(commentRepository
                .getCommentListByPostId(postId)
                .observeOn(schedulerProvider.ui())
                .subscribe({ commentList.value = it }, { commentListError.value = it }))
    }
  
    override fun onCleared() {
        compositeDisposable.clear()
    }
}