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I am trying to implement Realm Version management with dagger2, with this link Adavis Realm Migration, but getting following error,

[Dagger/MissingBinding] java.util.Map> cannot be provided without an @Provides-annotated method. public abstract interface CoreComponent { ^

The codes are as follows,

interface VersionMigration {
fun migrate(realm: DynamicRealm, oldVersion: Long)
}

class RealmVersion1Migration @Inject constructor(): VersionMigration {

override fun migrate(realm: DynamicRealm, oldVersion: Long) {

    val schema = realm.schema

    if (0 == oldVersion.toInt()) {

        schema.create("RealmAlbumEntity")
            .addField("album_id", String::class.java, FieldAttribute.PRIMARY_KEY)

        Timber.e("migration V1 complete")
    }
}
}

 @Reusable
class ERealmMigration @Inject constructor(
private val versionMigrations:
Map<Int, Provider<VersionMigration>>
) : RealmMigration {

init {
    Timber.e("IN Realm Migration")
}
override fun migrate(
    realm: DynamicRealm,
    oldVersion: Long,
    newVersion: Long
) {
    for (i in oldVersion.toInt() until newVersion) {
        val provider: Provider<VersionMigration> = versionMigrations.getValue(i.toInt())
        val versionMigration = provider.get()
        versionMigration.migrate(realm, i)
    }
}

}

This is my included module in realmConfig, private const val REALM_SCHEMA = 1L

 @Module(includes = [MigrationsModule::class])
 class RealmConfigModule {

@Provides
@AppScope
fun provideRealm(realmConfiguration: RealmConfiguration): Realm {
    return Realm.getInstance(realmConfiguration)
}

@Provides
@AppScope
fun provideRealmConfiguration(
    @Named(CONTEXT_APPLICATION) application: Application,
    realmMigration: ERealmMigration
): RealmConfiguration {

    val config = RealmConfiguration.Builder().name(application.getString(R.string.real_db_name))
        .schemaVersion(REALM_SCHEMA)
        .migration(realmMigration)
        .modules(UserRealmModule(), EventRealmModule())
        .build()

    Realm.setDefaultConfiguration(config)

    return config
}

}

And this is my AppComponent,

@Component(modules = [RealmConfigModule::class])
@AppScope
interface CoreComponent {

@Component.Factory
interface Factory {
    fun create(@BindsInstance application: Application): CoreComponent
}

}

I had tried to get through following links, but not able to gather any usefull contents out of it. Link 1 Link 2 Link 3

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  • You have used `ERealmMigration` in your **module** but never provide it with it's map content. Then how can dagger handle it? – Md. Asaduzzaman Feb 02 '20 at 07:07
  • Even, i define it in dagger, it still provide me same error, as for now it's a feature called MultiBinding, by dagger2 – Reprator Feb 02 '20 at 07:10

1 Answers1

0

It's a simple mistake, i just have to add "@JvmSuppressWildcards", 

 @Reusable
class ERealmMigration @Inject constructor(
private val versionMigrations:
Map<Int,   @JvmSuppressWildcards Provider<VersionMigration>>
) : RealmMigration

, thanks to this answer, from this user,

kotlin + Dagger2 : cannot be provided without an @Provides-annotated method

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