Error message: "Cannot find overview model!"

[miguel-swift-glen]

The project I’m working on has a scene which is supposed to display a PDF in the future, therefore it doesn’t need to be bind to any model. However, if I don’t select any model, an error will be thrown in the browser console. If I select any model the error will disappear, but that doesn’t seem like the correct way to fix it.

What’s the proper way of fixing this error?

[denise-narrow-token]

Hi @miguel-swift-glen,
thank you for your question! I unfortunately don’t have an answer for you yet, because we in TPS need to investigate this a bit further. TPS will look into this in A12PS-769 and we will update you once we know more.

[ahmad-warm-vale]

Hi @miguel-swift-glen ,
I think that happened because of the data loading, as mentioned in Data Loading the Client can evaluate if the data loading is needed depending on:

1. If the matching scene has models defined, e.g. models: [{ modelType: "form", name: "Product" }], the runtime automatically performs model and data loading in parallel.

2. If the matching scene has no models defined, but the boolean flag loadData: true, the runtime automatically performs data loading.

in your case, if there is no model added then you have to set the boolean flag loadData: true.

---

Anyway, if that’s not work I can suggest linking the current Scene with an Overview Model and keeping the type of the Scene Change as it is (VIEW_ADD), then adding another Scene and adding the first scene to the Prior Scene with REGION_CLEAR Scene Change type.

[christina-soft-reed]

Thanks for your answer!
We have a similar problem: Whenever we open an errorModal we get dais error.
Unfortunately, setting the boolean flag loadData to true for this scene doesn’t change anything in our case.

[vinh-neural-shore]

Hi @ahmad-warm-vale,

Thanks for your suggestions.
I took over the ticket and tried your suggestions but it doesn’t work. Please keep me updated if you have any news.

[markus-agile-fog]

from my understanding what you are missing is either better defined descriptor for your activity, or an own dataProvider that will be in charge for handling descriptor with prop instance = false / undefined (or both )
See PlatformDocumentListDataLoader:

// @com.mgmtp.a12.client\client-core\src\extensions\platform-server-connectors\internal\loaders\PlatformDocumentListDataLoader.ts
canHandle(activityDescriptor: Activity.Descriptor): boolean {
        // will always handle if no other dataHandler is provided beforehand
		return !activityDescriptor.instance;
	}

	async load(
		activity: Activity,
		_documentModel: DocumentModel | undefined,
		models: ModelAPI[]
	): Promise<Data> {
		const overviewModel = models.find(Model.isOverviewModel);
		if (overviewModel === undefined) {
            // this is your error
			return Promise.reject("Cannot find overview model!");
		}

        ...

Try to set {instance: true} for your descriptor if you want a placeholder for showing a pdf later.