I'm trying to figure out the same thing. When I add a package, it allows me to add the package to ONE target, but it won't let me add to multiple targets. In this case, I'm looking to add a package to the iOS AND macOS targets of a project created using the new multiplatform template.
nisenedeveloper
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I'm afraid i'm in a similar situation. while @malc's response seems aimed at turning the return of the FetchRequest into an array, the problem I'm seeing is that the 'children' parameter is not compatible with the CoreData output of a relationship.
@Cody Brimhall, @Curt Clifton - Is it possible to get some sample code showing how Apple envisions this working? Given what I'm seeing now, it almost looks like I'll need to ignore the OutlineGroup, and build a custom component out of disclosures. I'm wanting to confirm that I've exhausted all possibilities before doing so.