Hi, with dagger multibinding, is there a way to default to empty set if non are found? Now it throws...

# android-architecture

[ursus]

Hi, with dagger multibinding, is there a way to default to empty set if non are found? Now it throws an error

[gildor]

You can add an specify empty set by default

[gildor]

See official doc ; Section Declaring Multibindings)
https://dagger.dev/dev-guide/multibindings.html

[ursus]

Hmm I might be blind but not sure.

Do you mean this?

@Module
class MyEmptySetModule {
  @Provides @ElementsIntoSet
  static Set<Foo> primeEmptyFooSet() {
    return Collections.emptySet();
  }
}

[gildor]

Yes

[gildor]

Or
@Multibinds abstract Set<Foo> aSet();

[gildor]

It literally explains your case

You do not have to use @Multibinds for sets or maps that have at least one @IntoSet, @ElementsIntoSet, or @IntoMap binding, but you do have to declare them if they may be empty.

[ursus]

Yes but the issue is I dont really know if its going to be none ahead of time. Well I could but it requires thinking. The use case is monorepo. Now im building a new app which includes some modules out of which none put the moshi adapters into the graph. Sure I can place the empty set as in the sample to make it work, but then as the app grows I need the remember to remove the empty on first actual adapter include. But okay ill live with that. Thankd!

[gildor]

No need to remember to remove it at all, it will not override existing bindigs, it just doesn't fail on compilation, so you say "it's fine if set is empty"

[gildor]

Also, it can be a part of module which requests this set, so module says "I do not require this set to be non-empty"