advanced patterns with ViewModelScope and Retrofit Callbacks in Kotlin
I'm trying to debug I'm testing a new approach and I'm working on a project and hit a roadblock... I'm relatively new to this, so bear with me. I'm experiencing unexpected behavior when making Retrofit calls within a ViewModel's `viewModelScope`. I'm using Kotlin Coroutines alongside Retrofit 2.9.0 and I have set up my API service correctly. However, when I attempt to make a network call, the app sometimes crashes with a `java.lang.IllegalStateException: Job was cancelled; coroutine scope is inactive`. This occurs sporadically and I need to pinpoint the exact cause. Here’s a snippet of my ViewModel code: ```kotlin class MyViewModel(private val apiService: ApiService) : ViewModel() { fun fetchData() { viewModelScope.launch { try { val response = apiService.getData() // Retrofit call // Process response } catch (e: Exception) { Log.e("MyViewModel", "behavior fetching data", e) } } } } ``` And here’s how I’m using the ViewModel in my Fragment: ```kotlin class MyFragment : Fragment() { private lateinit var viewModel: MyViewModel override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { viewModel = ViewModelProvider(this).get(MyViewModel::class.java) viewModel.fetchData() return inflater.inflate(R.layout.fragment_my, container, false) } } ``` I’ve also verified that the API service is returning the expected results when called directly in a non-coroutine context. I've tried wrapping the Retrofit call with a `withContext(Dispatchers.IO)` block, but that did not resolve the scenario. Additionally, I checked that the Fragment is not getting destroyed while the network call is still in progress. Any advice on how to debug this scenario or ensure that the coroutine is not being cancelled unexpectedly would be greatly appreciated! I'm working on a web app that needs to handle this. How would you solve this? Is there a better approach? I'd love to hear your thoughts on this. Any suggestions would be helpful. My team is using Kotlin for this service. Any advice would be much appreciated.