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POCore Data: deleteObject crashes application, NSPredicate the cause?
 

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  1. POCore Data: deleteObject crashes application, NSPredicate the cause?
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    <p>I'm using a UICollectionView along with Core Data.</p> <p>I can't seem to figure out why I can't remove an object from Core Data. It crashes at <code>[self.managedObjectContext deleteObject:animation];</code> with an <code>index 0 beyond bounds for empty array</code> error. The following method is a delegate method that gets invoked from another viewcontroller. It gets a timestamp NSInteger and should create an NSPredicate with that timestamp.</p> <p>The strange thing is that when I take the animationTimestamp NSInteger and hardcode it like: <code>[NSPredicate predicateWithFormat:@"timestamp == %i", @"1370169109"]</code> it works and the object gets deleted without the error. However, when I want to pass the parameter as the argument it crashes. I've tried making it a string, NSNumber etc. Nothing works when I take the parameter, it only does when I hardcode it. I've logged animationTimestamp and it shows the correct value, so I'm stuck.</p> <p>Thanks!</p> <pre><code>- (void)deleteAnimationWithTimestamp:(NSInteger)animationTimestamp { NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"Animations" inManagedObjectContext:self.managedObjectContext]; NSPredicate *predicate = [NSPredicate predicateWithFormat:@"timestamp == %i", animationTimestamp]; [fetchRequest setPredicate:predicate]; [fetchRequest setEntity:entity]; NSError *error; NSArray *animations = [self.managedObjectContext executeFetchRequest:fetchRequest error:&amp;error]; for (NSManagedObject *animation in animations) { [self.managedObjectContext deleteObject:animation]; } // Save core data if (![self.managedObjectContext save:&amp;error]) { NSLog(@"Couldn't save: %@", [error localizedDescription]); } [self.animationsCollectionView reloadData]; } </code></pre> <p>EDIT: More info that might matter. The timestamp attribute in the model is a 64 bit integer (should it be by the way?). When I create the object I use:</p> <pre><code>NSNumber *timestampNumber = [NSNumber numberWithInt:timestamp]; [newAnimation setValue:timestampNumber forKey:@"timestamp"]; </code></pre>
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USMartin van der Woude
    1. USMartin van der Woude
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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      1. PTAnswer
    1. This table or related slice is empty.
    1. CODoes your object have a relationship dependency to any other entity?
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      1. POCore Data: deleteObject crashes application, NSPredicate the cause?
      1. USkushyar
    2. COtry to change from %i to %d in your predicate
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      1. POCore Data: deleteObject crashes application, NSPredicate the cause?
      1. USValent Richie
    3. CO@kushyar I only have one entity, Animations.
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      1. POCore Data: deleteObject crashes application, NSPredicate the cause?
      1. USMartin van der Woude
 

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