AppDatabase.kt

@Database(entities = [RoomMovie::class], version = 1) // an array with entites and the current db version
@TypeConverters(value = [DateTypeConverter::class]) // an array of all type converters
abstract class AppDatabase : RoomDatabase() {
  abstract fun movieDao(): MovieDao

  companion object {
    @Volatile
    private var instance: AppDatabase? = null

    fun getInstance(context: Context): AppDatabase =
        instance ?: synchronized(this) {
          instance ?: buildDatabase(context).also { instance = it }
        }

    private fun buildDatabase(context: Context): AppDatabase =
        Room.databaseBuilder(context, AppDatabase::class.java, "MoviewDb")
            .fallbackToDestructiveMigration() // destructively recreate database tables or you can write your own migration
            .build()
  }
}