struct HistoryView: View {
       @Environment(\.managedObjectContext) private var viewContext
       @EnvironmentObject private var persistenceController: PersistenceController
       let piggy: Piggy
   
       @FetchRequest private var items: FetchedResults<PurchasedItem>
   
       init(piggy: Piggy) {
           _items = FetchRequest<PurchasedItem>(
               sortDescriptors: [NSSortDescriptor(keyPath: \PurchasedItem.timestamp, ascending: false)],
               predicate: NSPredicate(format: "piggyStored == %@", piggy)
           )
           self.piggy = piggy
       }
       
       var body: some View {
         NavigationView {
             if (items.count != 0) {
                 List {
                     ForEach(items) { item in
                       // view related code
                     }
                 }
             }
          }
       }
   }