Preview Fails When Linking Component to Non-Default Data Model

[lassopicasso]

Description of the bug

When using multiple data models and attempting to link a component to a data model other than the default, the preview fails to render, and the following error appears in the console: altinn-app-frontend.js:8 TypeError: Cannot read properties of undefined (reading 'getSchemaForPath')

It seems the issue is caused by the lack of a mock in the backend preview, where all data types should be available.

The backend code related to this issue includes:

• InstanceForNextTask returns data types

  altinn-studio/backend/src/Designer/Controllers/Preview/InstancesController.cs

  Line 71 in 5b21dae

  public async Task<ActionResult<Instance>> InstanceForNextTask(string org, string app, [FromRoute] int partyId, CancellationToken cancellationToken)

• GetDataTypesForInstance the service responsible for setting the data types.

  altinn-studio/backend/src/Designer/Services/Implementation/PreviewService.cs

  Line 150 in 5b21dae

  // All data types attached to the current task in the process model should be added here

Video:

error-when-bind-other-than-default-datatype.mp4

Steps To Reproduce

1. Go to Datamodell page.
2. Create and generate a new data model.
3. Navigate to Utforming and select a layout set.
4. Add a component to the layout.
5. Configure the component so it is rendered in preview.
6. Change the data model binding to a model that is not the default.

Additional Information

No response