如何在Android Room CrossReference实体中查询特殊的“多对多关系”用例的数据？

如何解决如何在Android Room CrossReference实体中查询特殊的“多对多关系”用例的数据？

我按照android开发者指南定义了Room多对多关系： https://developer.android.com/training/data-storage/room/relationships#many-to-many

data class Playlist(
    @PrimaryKey val playlistId: Long,val playlistName: String
)

@Entity
data class Song(
    @PrimaryKey val songId: Long,val songName: String,val artist: String
)

@Entity(primaryKeys = ["playlistId","songId"])
data class PlaylistSongCrossRef(
    val playlistId: Long,val songId: Long
)

data class PlaylistWithSongs(
    @Embedded val playlist: Playlist,@Relation(
         parentColumn = "playlistId",entityColumn = "songId",associateBy = @Junction(PlaylistSongCrossRef::class)
    )
    val songs: List<Song>
)

// Dao
@Transaction
@Query("SELECT * FROM Playlist")
fun getPlaylistsWithSongs(): List<PlaylistWithSongs>

以上工作正常。但是，我还想根据歌曲所属的播放列表保存歌曲的声音属性（即基本音量...）。对于同一首歌曲，在“聚会”播放列表中时音量较高，而在“冷却”播放列表中时音量较低。对于相同的播放列表，类似的情况是，某些歌曲的音量较高，其余歌曲的音量较低。

所以我更改了上面的PlaylistSongCrossRef并添加了以下内容：

@Entity(table="playlistSongCrossRef",primaryKeys = ["playlistId",val songId: Long,val baseVolume: Double
)

data class PlaylistWithSongs(
    @Embedded val playlist: Playlist,associateBy = Junction(PlaylistSongCrossRef::class)
    )
    val songs: List<Song>
    @Relation(
         parentColumn = "playlistId",entityColumn = "baseVolume",associateBy = Junction(PlaylistSongCrossRef::class)
    )
    val baseVolumes: List<PlaylistSongCrossRef>
)

// Dao
@Query("SELECT * FROM Playlist WHERE playlistId = :playlistId ")
fun getPlaylistsWithSongs(playlistId: Int): List<PlaylistWithSongs>

但是，dao查询无法正常工作。当相同的baseVolume存储在不同的song-playlistCrossRef对中时，查询将返回重复的条目。

我不确定这是否是dao中的错误查询，还是我需要重新设计Room DB结构。提前非常感谢您！