android - 如何实现 Room 实体的继承(Android、Kotlin)

Question

我是 Room 新手，没有找到任何与此相关的帖子。
我有两个类:BaseModel 和 ChildModel。 ChildModel 是 Room 实体类，但 BaseModel - 不是。如何正确从 ChildModel 扩展 BaseModel？我试着按照下面的代码来做......
BaseModel.kt:

@Parcelize
open class BaseModel(
    open val id: String,
    open var name: String,
    open var creator: String,
    open var dateOfLastEdit: Timestamp,
    open var contributors: List<String>,
    open var color: Int,
    open var offline: Boolean
) : Parcelable {...} 

ChildModel.kt (用于 firebase 的空构造函数):

@Entity
@Parcelize
data class ChildModel(
    @PrimaryKey(autoGenerate = false)
    override val id: String = "",
    override var name: String = "",
    override var creator: String = "",
    @TypeConverters(DateTypeConverter::class)
    override var dateOfLastEdit: Timestamp = currentTime(),
    @TypeConverters(ListStringConverter::class)
    override var contributors: List<String> = emptyList(),
    override var color: Int = NO_COLOR,
    override var offline: Boolean = false,
    var text: String = "",
    var lastEditTextPosition: Int = 0,
    var lastEditNamePosition: Int = 0,
    var lastUserEdited: String = ""
) : Parcelable, BaseModel(id, name, creator, dateOfLastEdit, contributors, color, offline) {
    constructor() : this("", "", "", currentTime(), emptyList(), NO_COLOR, false, "", 0, 0, "") 
...
}

...但它给出了错误: “字段具有非唯一的列名”对于从 BaseModel 覆盖的所有字段。顺便说一句，当创建 BaseModel 作为接口(interface)时，它会成功构建。
我的数据库类:

@Database(entities = [ChildModel::class], version = 1)
@TypeConverters(DateTypeConverter::class, ListStringConverter::class) 
    abstract class CustomDatabase : RoomDatabase() {
    abstract fun childModelDao(): ChildModelDao

    companion object {
        var INSTANCE: CustomDatabase? = null

        fun getDatabase(context: Context): CustomDatabase? {
            if (INSTANCE == null) {
                synchronized(CustomDatabase::class) {
                    INSTANCE = Room.databaseBuilder(
                        context.applicationContext,
                        CustomDatabse::class.java,
                        DATABASE
                    ).build()
                }
            }
            return INSTANCE
        }
        fun destroyDatabase() {
            INSTANCE = null
        }
    }
}

该错误与升级数据库版本无关，因为我删除了上一个。
提前致谢!

Answer 1

好的，似乎 Room 以某种方式创建了两个具有相同名称的列(对于父类和对于子类)我尝试添加 @Ignore BaseModel 类中每个字段上方的注释。它解决了问题，项目成功构建，但我不确定这是最好的方法。