CODEWITHSUNDEEP
kotlindagger-2
Mumi
Mumi

Reputation: 351

dagger @IntoSet not work in kotlin object?

I used example in https://google.github.io/dagger/multibindings

Module A

@Module
object MyModuleA {
    @Provides
    @IntoSet
    fun provideOneString(): String {
        return "ABC"
    }
}

Module B

@Module
object MyModuleB {
    @Provides
    @ElementsIntoSet
    fun provideSomeStrings(): Set<String> {
        return HashSet<String>(Arrays.asList("DEF", "GHI"))
    }
}

component

@Component(modules = [ MyModuleA::class, MyModuleB::class])
interface MyComponent {
    fun strings(): Set<String>
}

test

@Test
fun testMyComponent() {
    val myComponent = DaggerMyComponent.builder().build()
    println("${myComponent.strings()}")
}

It show error with MyModuleA must be set, but changing module from object to class is work fine.

@Module
class MyModuleA {
    @Provides
    @IntoSet
    fun provideOneString(): String {
        return "ABC"
    }
}

@Module
class MyModuleB {
    @Provides
    @ElementsIntoSet
    fun provideSomeStrings(): Set<String> {
        return HashSet<String>(Arrays.asList("DEF", "GHI"))
    }
}

@IntoSet annotation is not work in kotlin object?

Upvotes: 1

Views: 3598

Answers (1)

drruggeri
drruggeri

Reputation: 420

I ran into the same problem and this answer solved it for me.

Dagger 2 multibindings with Kotlin

In short, you need to use Set<@JvmSuppressWildcards String> intead, because of the way that kotlin handles type variance in generics.

Upvotes: 10

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