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Hope someone can explain what's going on. If I get an object from my Core Data model, modify a property which is not persisted or even defined in the model! and then destroy and get the object again the value is still as previously set. Why is this? Promotion *promotion = [Promotion promotionWithId:[NSNumber numberWithInt:1512] inManagedObjectContext:context]; [promotion setQuantity:[NSNumber numberWithInt:2]]; NSLog(@"%d", [promotion.quantity intValue]); promotion = nil; promotion = [Promotion promotionWithId:[NSNumber numberWithInt:1512] inManagedObjectContext:context]; NSLog(@"%d", [promotion.quantity intValue]); promotion = nil; Output is: 2 2 For information purposes: +(Promotion *)promotionWithId:(NSNumber *)promotionId inManagedObjectContext:(NSManagedObjectContext *) context { NSFetchRequest *fetchReq = [[NSFetchRequest alloc]init]; [fetchReq setEntity:[NSEntityDescription entityForName:@"Promotion" inManagedObjectContext:context]]; NSPredicate *query = [NSPredicate predicateWithFormat:@"promotionId=%d", [promotionId intValue]]; [fetchReq setPredicate:query]; NSMutableArray *resultArray = [[NSMutableArray alloc]initWithArray:[context executeFetchRequest:fetchReq error:nil]]; if([resultArray count] > 0) { return [resultArray objectAtIndex:0]; } return nil; }

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