Swift CoreData saving and fetching from a relationship - swift

Question

I have coredata in my swift app. I am able to get the two textfields.text to save to core data and the fetch it, but those 2 properties are part of 1 entity. I also have a few other entities with relationships all set up.
When I save to core data what happens is the 2 strings come through, but the relationship strings are nil and the app crashes.
Here is some of my set up
// MARK: NSFetchedResultsControllerDelegate
extension SavedPalauttesViewController: NSFetchedResultsControllerDelegate {
func controllerWillChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
tableView.beginUpdates()
}
func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
tableView.endUpdates()
}
func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) {
switch(type) {
case .insert:
if let indexPath = newIndexPath {
tableView.insertRows(at: [indexPath], with: .fade)
}
break
case .delete:
if let indexPath = indexPath {
tableView.deleteRows(at: [indexPath], with: .fade)
}
break
case.update:
if let indexPath = indexPath{
let cell = tableView.cellForRow(at: indexPath) as! LocalPalautteTableViewCell
configureCell(cell: cell, indexPath: indexPath as NSIndexPath)
}
break
case .move:
if let indexPath = indexPath {
tableView.deleteRows(at: [indexPath], with: .fade)
}
if let indexPath = newIndexPath {
tableView.insertRows(at: [indexPath], with: .fade)
}
break
}
}
func attemptFetch() {
let fetchRequest: NSFetchRequest<Palautte> = Palautte.fetchRequest()
let nameSort = NSSortDescriptor(key: "name", ascending: false)
fetchRequest.sortDescriptors = [nameSort]
let controller = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: context, sectionNameKeyPath: nil, cacheName: nil)
controller.delegate = self
self.controller = controller
do {
try controller.performFetch()
} catch {
let error = error as NSError
print("\(error)")
}
}
}
Now the category of type string and name of type string work fine
but when I try to save any of the background colors or foreground...I get nil and a crash
this is part of how I am attempting to save to core data
palauttePalautte.category = finalPalautteCategoryValue ?? ""
palauttePalautte.toBackgroundColor?.redValue = String(Int(redBackgroundColorValue))
but on the 2nd vc when I try to get a value for it I crash
let backRed = palautte.toBackgroundColor?.redValue ?? ""
What am I doing wrong?