Final Code in "Populate the database" needs correction

[hellowahab]

Code in final code within "Populate the database" needs correction as follows

`// Annotates class to be a Room Database with a table (entity) of the Word class
@database(entities = arrayOf(Word::class), version = 1, exportSchema = false)
public abstract class WordRoomDatabase: RoomDatabase() {

abstract fun wordDao(): WordDao

private class WordDatabaseCallback(
    private val scope: CoroutineScope
) : RoomDatabase.Callback() {

    override fun onOpen(db: SupportSQLiteDatabase) {
        super.onOpen(db)
        INSTANCE?.let { database ->
            scope.launch {
                populateDatabase(database.wordDao())
            }
        }
    }

    suspend fun populateDatabase(wordDao: WordDao) {
        // Delete all content here.
        wordDao.deleteAll()

        // Add sample words.
        var word = Word("Hello")
        wordDao.insert(word)
        word = Word("World!")
        wordDao.insert(word)

        // TODO: Add your own words!
        word = Word("TODO!")
        wordDao.insert(word)
    }
}


companion object {
    // Singleton prevents multiple instances of database opening at the
    // same time.
    @Volatile
    private var INSTANCE: WordRoomDatabase? = null

    fun getDatabase(
        context: Context,
        scope: CoroutineScope
    ): WordRoomDatabase {

        // if the INSTANCE is not null, then return it,
        // if it is, then create the database
        return INSTANCE ?: synchronized(this) {
            val instance = Room.databaseBuilder(
                context.applicationContext,
                WordRoomDatabase::class.java,
                "word_database"
            )
                .addCallback(WordDatabaseCallback(scope))
                .build()
            INSTANCE = instance
            // return instance
            instance
        }
    }
}

}`

[florina-muntenescu]

Fixed