Dagger parent-child example

DaggerParentChildExample.kt

// Deps

interface Database
interface Network

// Child

interface ChildRepository

class Child(dependencies: Dependencies) {
    interface Dependencies {
        val database: Database
        val network: Network
        val repository: ChildRepository
    }
}

// Parent

class Parent(dependencies: Dependencies) {
    init {
        val component = DaggerParentComponent.factory().create(dependencies)
        val child = component.child() // Get the Child
    }

    interface Dependencies {
        val database: Database
        val network: Network
    }
}

internal class ChildRepositoryImpl : ChildRepository

@Module
internal class ParentModule {

    @Provides
    fun childRepository(): ChildRepository = ChildRepositoryImpl()

    @Provides
    fun child(component: ParentComponent): Child = Child(component)
}

@Component(
    modules = [ParentModule::class],
    dependencies = [Parent.Dependencies::class]
)
internal interface ParentComponent : Child.Dependencies {

    fun child(): Child

    @Component.Factory
    interface Factory {
        fun create(
            dependencies: Parent.Dependencies
        ): ParentComponent
    }
}