我无法将数据一张表插入房间的另一张表

Question

在我的应用程序的房间数据库中，我有一个名为movie_table 的表。当用户单击该项目时，它会保存到另一个名为favorite_table 的表中。我尝试了将近两天，但我无法解决它。我是 MVVM 的新手。 为了更好地理解，请查看代码：

FavoriteMovieDao.kt

    
    @Dao
    interface FavoriteMovieDao {

    @Insert(onConflict = OnConflictStrategy.REPLACE)
    suspend fun insertFavMovie(favorite: Favorite)

    @Query("SELECT * FROM favorite_table WHERE id LIKE :id")
    suspend fun getFavoriteMovieById(id:Int): Favorite

    @Query("SELECT * FROM favorite_table")
    suspend fun getAllFavoriteMovie(): List<Favorite>

    @Delete
    suspend fun deleteFavorite(favorite: Favorite)
    }

Repository.kt

    class Repository(context: Context) {
        private val favoriteMovieDao: FavoriteMovieDao = MovieDatabase.invoke(context).getFavoriteMovieDao()
    suspend fun insertFavMovie(favorite: Favorite){
        favoriteMovieDao.insertFavMovie(favorite)
    }

MovieDetailsViewModel.kt

    class MovieDetailsViewModel(private val repository: Repository):ViewModel() {
        private val favMovieResponse:MutableLiveData<List<Favorite>> = MutableLiveData()
        val actorResponse:MutableLiveData<List<Movie>> = MutableLiveData()
        private val insertFavMovie:MutableLiveData<Favorite> = MutableLiveData()

        fun actorDetail(){
            viewModelScope.launch {
                val actor = repository.getAllMovieDB()
                actorResponse.value = actor
            }
        }

        fun insertFavMovie(favorite: Favorite){
            viewModelScope.launch {
                //i can't insert this
                val insertFav = repository.insertFavMovie(favorite)
                insertFavMovie.value = insertFav
            }
        }
    }
 }

MovieDetailsActivity.kt

class MovieDetailsActivity : AppCompatActivity(){

private lateinit var actorViewModel: MovieDeatilsViewModel
private val actorAdapter by lazy { ActorAdapter() }
private var isFav: Boolean = false


override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_movie_details)


    val repository = Repository(this)
    val viewModelFactory = MovieDetailsViewModelFactory(repository)
    actorViewModel = ViewModelProvider(this,viewModelFactory).get(MovieDeatilsViewModel::class.java)

    setUpPostRecyclerView()
    actorViewModel.actorDetail()
    actorViewModel.actorResponse.observe(this, Observer {actorList ->
        actorAdapter.setData(actorList)
    })

    initBundle()
    
    favBtn.setOnClickListener {
        if (isFav){
            isFav = false
            favBtn.supportImageTintList = ColorStateList.valueOf(Color.parseColor("#E4C1C1"))

            Log.d("msg","Not Favorite!")
        }else{
            isFav = true
            favBtn.supportImageTintList = ColorStateList.valueOf(Color.parseColor("#FFC107"))
            Log.d("msg","Favorite!")
        }
    }

}

private fun initBundle() {
    val bundle:Bundle? = intent.extras
    movieTitle.text = bundle!!.getString("title")
    directorbc.text = bundle.getString("director")
    genre.text = bundle.getString("genre")
    releaseYear.text = bundle.getInt("year").toString()
    language.text = bundle.getString("language")
    country.text = bundle.getString("country")
    rating.text = bundle.getString("rating")
    plotText.text = bundle.getString("plot")
    //moviePosterD.setImageDrawable(bundle!!.getString("image"))
    Glide.with(this).load(bundle.getString("image")).into(moviePosterD);

    val player = SimpleExoPlayer.Builder(this).build()
    player.preparePlayer(movieView)
    player.setSource(applicationContext, "http://html5videoformatconverter.com/data/images/happyfit2.mp4")

}

private fun setUpPostRecyclerView(){
    actorRecyclerview.adapter = actorAdapter
    actorRecyclerview.layoutManager = LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL,false)
}

}

如何插入？请帮我。谢谢

Answer 1

在电影表中，要处理最喜欢的电影，您可以在每个电影项目中使用一个变量，例如可以将其设置为 true 或 false。这允许您使用过滤器进行查询以在屏幕上显示它们。我认为您不需要另一张桌子来存储收藏夹。我希望这会有所帮助！如果您在此处分享更多详细信息，我可以帮助您进行设计。

@Entity
data class Movie( val title: String, val isFavourite: Boolean = false)

更新 1：

当用户点击favButton 时，MovieViewModel 中的 Movie 实体更新如下：

fun setMovie(movie: Movie){
        _movie.value = movie
    }
fun updateMovie(movie: Movie) {
        movie.isFavourite = !movie.isFavourite
        viewModelScope.launch {
            repository.updateMovie(movie)
            setMovie(movie)
        }
    }

在MovieDao

@Update
suspend fun updateMovie(movie: Movie)

更新 2： 在MoviesDao

 @Update
    suspend fun updateMovie(movie: Movie)

    @Insert(onConflict = OnConflictStrategy.IGNORE)
    suspend fun insertAll(vararg movie: Movie)

    @Query("select * from movies_table where isFavourite = 1")
    fun getFavMovies(): LiveData<List<Movie>>

    @Query("Select * from movies_table")
    fun getAllMovies(): LiveData<List<Movie>>

在存储库中

val favMovies: LiveData<List<Movie>> = moviesDao.getFavMovies()

更新 3：

 favBtn.setOnClickListener {
            _viewModel.updateMovie(movie)
        }

_viewModel.movie.observe(viewLifecycleOwner, Observer {
            //Update UI based on isFavourite value on Movie
        })