Previewing ContentView with CoreData

Question

When I try to a SwiftUI ContentView that contains a CoreData fetch request, the preview crashes. Wondering what the correct way to setup the @environment so the preview can

Answer 1

Credit goes to @ShadowDES - in the Master/Detail template project in Xcode Beta 7 there's a preview that uses Core Data:

#if DEBUG
struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
        return ContentView().environment(\.managedObjectContext, context)
    }
}
#endif

This works for me in Xcode Beta 5 (my Beta 7 crashes)