Core Data Save Error (NSValidationErrorKey, Cocoa error 1570) saving NSDate

user_841130 0
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I'm getting an error with saving to a Core data object in Xcode.

Xcode says that the error is in the NSDate variable 'datum' but I have tried almost everything. Error is:

2011-07-12 18:01:29.068 WeekLijstje[3205:207] Core Data Save Error
NSValidationErrorKey    datum
NSValidationErrorPredicate  (null)

NSValidationErrorObject
<DagLijst: 0x6e2fcd0> (entity: DagLijst; id: 0x6e2fd30 <x-coredata:///DagLijst/t99F423FC-AAE9-4692-9264-EF0FF7A020572> ; data: {
    Voedsel = nil;
    datum = nil;
    hoeveelheid = 0;
    punten = 0;
})
NSLocalizedDescription:The operation couldn’t be completed. (Cocoa error 1570.)

A small code snipet:

        DagLijst *newDaglijst = [NSEntityDescription insertNewObjectForEntityForName:@"DagLijst" inManagedObjectContext:self.managedObjectContext];

        NSDate *selDatum = [NSDate date];
        newDaglijst.punten = [NSNumber numberWithInteger:10];
        newDaglijst.hoeveelheid = [NSNumber numberWithInt:100];
        newDaglijst.Voedsel = geselecteerdVoedsel;
        newDaglijst.datum = selDatum;
        NSError *error = nil;
        if (![newDaglijst.managedObjectContext save:&error]) {
...

Also the class of the DagLijst object:

@interface DagLijst : NSManagedObject {
@private
}
@property (nonatomic, retain) NSDate * datum;
@property (nonatomic, retain) NSNumber * punten;
@property (nonatomic, retain) NSNumber * hoeveelheid;
@property (nonatomic, retain) Voedsel *Voedsel;

@end

So you can see that I put an NSDate into the 'datum' variable. But on execution I still get an error.

nsdate xcode core-data
6 Answers

Your logging would look like this:

Fatal error: 'try!' expression unexpectedly raised an error: 
Error Domain=NSCocoaErrorDomain Code=1560 "(null)" UserInfo={NSDetailedErrors=(
...

It means you have an uncommitted change for one (or more) property of a entity, in which you told it is NOT optional, but you left it optional.

To find out which entity you failed to set value for a property, look for this in your logging:

UserInfo={NSValidationErrorObject=<YOURENTITYISHERE: ...>

To find out the property, search for:

NSValidationErrorKey=YOURPROPERTYISHERE

Somewhere in your code you forget to set a value for that property for the given entity.

user_77152500

To reinforce Michael's answer, you can check your Entity properties in the inspector. One of your items may be accidentally considered Optional, or not. Or, if you're like me, your "Delete Rule" might have been set to "Nullify", which made my Entity's relationship property Nil at runtime. Because my object-to-be-deleted had a One-To-Many relationship with some other objects, it prevented the parent objects from being deleted. Changing it to Cascade solved the problem.

Entity Inspector - Delete Rule

user_62145980
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