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POCore Data app crashing when using setValue:forKey: for many-to-many relationship
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11320123
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11320340
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2012-07-03T22:30:23.987
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2012-07-03T23:54:56.423
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2012-07-03T22:51:22.730
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text
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I have gone over this over and over, and cannot for the life of me figure out why assigning a relationship through setValue:forKey: is not working. My method is below. <pre><code>-(void)saveNewCartItemName:(NSString *)name Price:(float)price Qty:(int)qty Tax:(int)tax inCart:(NSDate *)cartDate{ NSManagedObject *newItem = [NSEntityDescription insertNewObjectForEntityForName:@"Item" inManagedObjectContext:self.appDelegate.managedObjectContext]; NSFetchRequest *query = [[NSFetchRequest alloc] initWithEntityName:@"Cart"]; NSLog(@"cartDate = %@", cartDate); [query setPredicate:[NSPredicate predicateWithFormat:@"cartDate = %@", cartDate]]; NSError *error; NSMutableArray *queryResults = [[self.appDelegate.managedObjectContext executeFetchRequest:query error:&error] mutableCopy]; NSLog(@"queryResults count = %d", [queryResults count]); if ([queryResults count] == 1) [newItem setValue:[queryResults objectAtIndex:0] forKey:@"cartThatHasItem"]; [newItem setValue:name forKey:@"itemName"]; [newItem setValue:[NSNumber numberWithFloat:price] forKey:@"itemPrice"]; [newItem setValue:[NSNumber numberWithInt:qty] forKey:@"itemQty"]; [newItem setValue:[NSNumber numberWithInt:tax] forKey:@"itemTax"]; [self.appDelegate.managedObjectContext save:&error]; } </code></pre> The line that it crashes on every time is: <pre><code>if ([queryResults count] == 1) [newItem setValue:[queryResults objectAtIndex:0] forKey:@"cartThatHasItem"]; </code></pre> My NSLog shows that there is a NSManagedObject to assign the relationship to, and I have double checked the name in the forKey: that there are no typos. All that Xcode tells me is that it prints out '(null)' on my console and then tells me 'libc++abi.dylib: terminate called throwing an exception' on the next line. Why is it crashing? And how do I fix it? Update: That's the entire error message. <pre><code>2012-07-03 18:28:57.844 appName[3063:11603] (null) libc++abi.dylib: terminate called throwing an exception (lldb) </code></pre>
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<iphone><ios><core-data>
Title
Core Data app crashing when using setValue:forKey: for many-to-many relationship
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