CoreData add object - ios

Question

I made an app which's using core data. I made a function which saves 1 or 2 values / write data into core data. This is the following method:
func saveName(name: String) {
let myDate:NSDate = NSDate()
let context = self.fetchedResultsController.managedObjectContext
let entity = self.fetchedResultsController.fetchRequest.entity!
let newManagedObject = NSEntityDescription.insertNewObjectForEntityForName(entity.name!, inManagedObjectContext: context) as NSManagedObject
if markCell == true {
newManagedObject.setValue(name, forKey: "markedCell")
markCell = false
}
else {
newManagedObject.setValue(name, forKey: "name")
newManagedObject.setValue(myDate, forKey: "datum")
}
// Save the context.
var error: NSError? = nil
if !context.save(&error) {
abort()
}
}
It occurs a crash in the function cellForRowAtIndexPath if markCell == true. If markCell == false (step into else) all works perfect.
If I run this function:
func saveName(name: String) {
let myDate:NSDate = NSDate()
let context = self.fetchedResultsController.managedObjectContext
let entity = self.fetchedResultsController.fetchRequest.entity!
let newManagedObject = NSEntityDescription.insertNewObjectForEntityForName(entity.name!, inManagedObjectContext: context) as NSManagedObject
newManagedObject.setValue(name, forKey: "markedCell")
markCell = false
newManagedObject.setValue(name, forKey: "name")
newManagedObject.setValue(myDate, forKey: "datum")
// Save the context.
var error: NSError? = nil
if !context.save(&error) {
abort()
}
}
no crash occurs but than I also added a value to markedCell. I only want to add a value into markedCell if the bool is set to true (the user pressed a button -> bool will be set to true and func saveNamewill be called).
Load data from core data (create UITableViewCell):
//Get task
let context = self.fetchedResultsController.managedObjectContext
let object = self.fetchedResultsController.objectAtIndexPath(indexPath) as NSManagedObject
var taskString:NSString
taskString = object.valueForKey("name") as String
cell.textLabel!.text = object.valueForKey("name") as? String
//Set accessory type
var request:NSFetchRequest = NSFetchRequest(entityName: "Person")
request.predicate = NSPredicate(format:"markedCell = %#", taskString)
var results : [NSManagedObject] = context.executeFetchRequest(request, error: nil) as [NSManagedObject]
if (results.count > 0) {
//Element exists
cell.accessoryType = UITableViewCellAccessoryType.DisclosureIndicator
println("Cell is marked")
}
else {
//Doesn't exist
cell.accessoryType = UITableViewCellAccessoryType.None
println("Cell isn't marked")
}

Answer 1

I can bet that the problem comes from the fact that markedCell is declared as optional property in your Core Data model while name or/and datum are not optional.
If this is the case your saving works fine when you enter the else loop because at that point you have:
markedCell == nil //this is allowed in your Core Data model
name != nil
datum != nil
However, when you do not enter into the else loop you have:
markedCell != nil
name == nil
datum == nil
and one of the last two lines is incompatible with your Core Data model. If you want to use your original code you need to ensure that all properties mentioned here are declared as optional.