How to pass an interface as parameter in koin

Question

I'm so beginner in koin.

I have a method that named "MesheRepoImpl" that get an interface as parameter.

I know that I can't pass an interface to a method in Koin, so I created a class and extends that from the interface then I added that class in koin module, so I use the class as parameter for MesheRepoImpl.

But android studio gives me this error:

Caused by: org.koin.core.error.NoBeanDefFoundException: |- No definition found for class:'com.app.meshe.data.repo.MesheRepo'. Check your definitions!

This is my Di module:

val mesheModule =
    module {
        single { getInstance(androidContext()) }
        single { MesheLocalDataSource() } //*
        single { MesheRepoImpl(get()) } //**
        factory { TaskViewModelFactory(get()) }
        viewModel { TaskViewModel(get()) }
        viewModel { RewardViewModel(get()) }
        viewModel {MainViewModel()}
    }

The 1 star line is my class that extends from the interface and the 2 stars line is the class that get interface as parameter.

How can I pass the interface as parameter, if I can't use a class?

Answer 1

Since there's still no answer, I'd advise you to consider going with

interface MesheRepo
class MeshoRepoImpl(): MeshoRepo

over your

interface MesheRepo
class MeshoRepoImpl(val IRepo: MeshoRepo)

So, just implement MeshoRepo over passing it as an argument to MeshoRepoImpl.

Trying to answer directly your question, you are able to define interfaces in Koin module and pass them, but you have to provide their implementations, as well:

val mesheModule = module {
  single<MeshoRepo> { MeshoRepoImpl() }
  single { MeshoRepoImpl(get()) } // <-- it's like a deadlock, so I still do not see any sense to pass an interface over implementing it
}

And, please, do not forget that an interface is not an object.