Hi. Does Koin support conditional creation of bean...

# koin

[Jakub Gwóźdź]

Hi. Does Koin support conditional creation of beans? With condition being depending on another bean’s properties?

I.E. so far my module looked like this:

data class Config(val fooConfig: String, val barConfig:String)

fun appModule() = module {
    single { ConfigProvider().load() }.bind(Config::class)
    single { Foo(get<Config>().fooConfig) }
    single { Bar(get<Config>().barConfig) }
}

and now I’d like to make fooConfig and barConfig nullable and create Foo(…) and Bar(…) only when their configs are not-null.
Is there a way to do it?

[s3rius]

single { get<Config>().barConfig?.let { Bar(it) } }

[s3rius]

That should do it, shouldn't it?

[Jakub Gwóźdź]

Tried, but checkModules() complains

[s3rius]

That sounds a bit like a bug. Seems like checkModules will not take null for a valid value, even if the type is nullable. Even just single<String?> { null } fails the check.

I guess you can get around it by using Option<Bar>.

[Jakub Gwóźdź]

Huh. That's a workaround worth considering. We're using arrow anyway, so that shouldn't be a problem... Thanks!