SharedViewModel -> shared between Parent Fragment and Child Fragments, but not bound to activity.

[wowonsdu]

Hello.

I need to have a viewModel, that will be created with thecreation of parent fragment, and shared between it's child fragments, but not bound to the activity, and I can't seem to find a way to do so? Is it possibile with koin?

The idea is, I have a big form fragment, which is splited into few different fragments depending on some logic, and I need all of the child fragments to communicate with the parent's viewModel, however I've noticed that the viewModel stays alive after the parent fragment was killed, which causes issues while opening the parent fragment again! ( it loads it's state ).

Any idea how this could be achieved, koin or not?

[Rayhan-kh]

I was looking for the same thing.
Navigation Graph ViewModel supposed to be the solution but it does not work with SavedStateHandle (or I was unable make it work).

class NavFragment : Fragment() {

    val mainViewModel: NavViewModel by koinNavGraphViewModel(R.id.my_graph)

}

[est7]

val fragmentsModule = module {
    scope(named("fragments_shared")) {
        
        scoped { SharedViewModel(get()) }
      
        scoped { pository() }
    }
}


class FirstFragment : Fragment(), KoinScopeComponent {
  
    override val scope: Scope by lazy { 
        getKoin().getOrCreateScope("fragments_shared_scope", named("fragments_shared"))
    }
    
  
    private val sharedViewModel: SharedViewModel by scope.inject()
    
    override fun onDestroy() {
        super.onDestroy()
       
        if (!requireActivity().supportFragmentManager.fragments.any { 
            it is SecondFragment || it is ThirdFragment 
        }) {
            scope.close()
        }
    }
}


class SecondFragment : Fragment(), KoinScopeComponent {
    override val scope: Scope by lazy { 
        getKoin().getOrCreateScope("fragments_shared_scope", named("fragments_shared"))
    }
    
    private val sharedViewModel: SharedViewModel by scope.inject()
}

class ThirdFragment : Fragment(), KoinScopeComponent {
    override val scope: Scope by lazy { 
        getKoin().getOrCreateScope("fragments_shared_scope", named("fragments_shared"))
    }
    
    private val sharedViewModel: SharedViewModel by scope.inject()
}