Learning Koin, how do I inject parameters in modul...

# koin

[Daniele Segato]

Learning Koin, how do I inject parameters in modules with koin-annotation?

take this very basic example…

@Module()
@ComponentScan("com.example.api")
class ApiModule

@Factory
class Api(
    @InjectedParam
    private val client: HttpClient,
)

// Application onCreate

startKoin {
  modules(
    ApiModule().module, // how do I inject the httpClient?
  )
}

how do I inject the http client in there?

[Daniele Segato]

the generated by ksp code

public val com_example_api_ApiModule : Module = module {
	factory() { params -> com.example.api.Api(params.get()) } 
}
public val com.example.api.ApiModule.module : org.koin.core.module.Module get() = com_example_api_ApiModule

[Daniele Segato]

If it makes more sense….

Pretend this is the structure

// HttpClientModule
@Factory
class HttpClientFactory(@InjectedParam config: HttpClientConfig)

@Module
class HttpClientModule {

  @Single
  fun httpClient(factory: HttpClientFactory): HttpClient = factory.create()
}

// ApiModule
@Factory
class ApiImpl(@InjectedParam httpClient: HttpClient)

// RepositoryModule
@Single
class RepositoryImpl(@InjectedParam api: Api)

class MyActivity: AppCompatActivity() {
  val repository by inject<Repository>()
}

basically in this whole mess the only thing I would need to inject from outside is “HttpClientConfig”

but how do I inject it? possibly only once

[Alexandru Caraus]

Remove the injected param annotation

[Alexandru Caraus]

Take first example, add a function annotated with @Single which will create http client

[Daniele Segato]

Thanks If i Do that I get an error from the ksp compiler (I’ve enabled KOIN_CONFIG_CHECK).

If I disable that check it works - I think this is a bug

[Daniele Segato]

I’ve created this bug report https://github.com/InsertKoinIO/koin-annotations/issues/121