Scope objects to viewmodel lifecycle

[ChristopherME]

I have the following situation. There are some objects I would like to instantiate only ONCE for the whole lifetime of my viewmodel. Something like @InstallIn(ViewModelComponent::class) does in dagger-hilt.

The following koin module is prepared for provide an instance of a viewmodel which is going to be injected into a fragment. The fragment can be replaced and added to the backstack (the viewmodel can survive the replace transaction).

val featureMoviesModule = module {

    factory { provideMoviesService(retrofit = get()) }

    factory<MoviesRemoteDataSource> {
        MoviesRemoteDataSourceImpl(
            connectivityUtils = get(),
            ioDispatcher = get(named("ioDispatcher")),
            errorParserAdapter = get(),
            movieService = get()
        )
    }

    /**
     * This is not so optimal due to viewModel is requiring also the mapper,
     * Therefore a new instance on MovieMapper is going to be created.
     * We ended up with 2 instances of MovieMapper.
     */
    factory<MovieMapper> { MovieMapperImpl(defaultDispatcher = get(named("defaultDispatcher"))) }

    factory<MoviesRepository> { MoviesRepositoryImpl(remoteDataSource = get(), mapper = get()) }

    viewModel { MovieListViewModel(moviesRepository = get(), mapper = get()) }

}

With this configuration I ended up with two MovieMapperImpl() instances, which is bad.

Describe the solution you'd like Some clear explanation of how to scope some items to the same lifetime of my viewmodel.

Describe alternatives you've considered Single works but I dont want a singleton instance for a mapper that is used only in one specific feature.

Target Koin project Im currently using koin 3.0.1

[scottkruse]

Any update on this? @ChristopherME

[ChristopherME]

0 updates about it @scottkruse ...

[scottkruse]

@ChristopherME I hacked around this but doesn't feel great.

module { viewModel { val sharedComponent = get<SharedComponent>() ExampleViewModel( get { parametersOf(sharedComponent) } ) } factory { (sharedComponent: SharedComponent) -> OtherComponent(sharedComponent) } }

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