I have a view in which i call @FetchRequest as below

@FetchRequest(entity: Sales.entity(), sortDescriptors: [NSSortDescriptor(keyPath: \Sales.dateToday, ascending: true)]) var mySales: FetchedResults<Sales>

I then call a delete function that delets all sales data in some different view

.alert(isPresented: $deleteData) {
                    Alert(title: Text("Are you sure you want to delete all data?"), primaryButton: .destructive(Text("Delete")) {
                        dataController.shouldReloadData = true  <------------toggle the observed property
                        deleteAll()
                        dataController.save()
                    }, secondaryButton: .cancel())

Now i do have a property in my DataController called

@Published var shouldReloadData = false

which i toggle here as you can see, but the when i go back to the view with

@FetchRequest(entity: Sales.entity(), sortDescriptors: [NSSortDescriptor(keyPath: \Sales.dateToday, ascending: true)]) var mySales: FetchedResults<Sales>

it does. not show the data as deleted , it is still there, how can i over come this?

Note - the data is gone once the app is sent to back ground and then opened again. so the data is deleted but the fetchrequest is not refreshed.

@deirdresm thanks , that worked perfectly and now i do not see any values in my view that uses the @FetchRequest, for any one else here , this is my deleteAll() method where i remove an image in documentsDirectory and data from coredata table

func deleteAll() {
        let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
        let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Sales")
        let deleteRequest = NSBatchDeleteRequest(fetchRequest: fetchRequest)

        do {
            let fileURLs = try FileManager.default.contentsOfDirectory(at: documentsURL, includingPropertiesForKeys: nil, options: .skipsHiddenFiles)
            let items = try managedObjectContext.fetch(fetchRequest)
            if items.isEmpty {
                emptyList = true
                return
            }
            for files in fileURLs {

                try FileManager.default.removeItem(at: files)
                try managedObjectContext.execute(deleteRequest)
                dataController.container.viewContext.reset()  <--------------where i now use reset as suggested in answer
            }

        } catch {
            print(error)
        }
    }