Florina Muntenescu and Parag Kadam. I don’t know if the Architecture guides’ suggestion under Persist Data to use Dagger2 is the best strategy for an app built with Kotlin.

As @Ajay points out in his post Building database with Room Persistence Library a Singleton pattern can be used to create a Database which achieves the same result as Dagger2. I’ve heard Dagger2 has issues with Kotlin and might be more complicated to get up and running.

@Database(entities = arrayOf(Content::class), version = 1)
@TypeConverters(Converters::class)
abstract class ContentDatabase : RoomDatabase() {

    abstract fun userDao(): ContentDao

    companion object {

        private var INSTANCE: ContentDatabase? = null

        fun getAppDatabase(context: Context): ContentDatabase {
            if (INSTANCE == null) {
                INSTANCE = Room.databaseBuilder(context.applicationContext,
                        ContentDatabase::class.java, "content-database")
                        .build()
            }
            return INSTANCE as ContentDatabase
        }

        fun destroyInstance() {
            INSTANCE = null
        }
    }
}