CODEWITHSUNDEEP
ioscore-data
Sharkfin
Sharkfin

Reputation: 11

Integer attribute in core data show up differently

In my core data entity, there is an attribute of Integer 32 type named validity.

There are two objects created earlier using this method:

- (void) AddMandatoryItems
{
    NSManagedObjectContext *context = [self managedObjectContext];
    NSManagedObject *newMonitorItem = [NSEntityDescription
                                       insertNewObjectForEntityForName:@"MonitorItem"
                                       inManagedObjectContext:context];
    //
    // Other codes here
    //
    [newMonitorItem setValue:[NSNumber numberWithInt:35]
                      forKey:@"validity"];
   [self.monitorItemArray addObject:newMonitorItem];

    NSError *error = nil;
    if (![context save:&error])
    {
        NSLog(@"Can't Save! %@ %@", error, [error localizedDescription]);
    }

    //
    // other codes here
    //
    [newMonitorItem setValue:[NSNumber numberWithInt:90]
                      forKey:@"validity"];
    [self.monitorItemArray addObject:newMonitorItem];

    if (![context save:&error])
    {
        NSLog(@"Can't Save! %@ %@", error, [error localizedDescription]);
    }

    // Return the number of rows in the section.

}

The validity values are 35 and 90 for the first and second objects respectively.

The two values are loaded like this:

- (void)viewDidLoad
{

//
// Other codes here
//

    NSManagedObjectContext *managedObjectContext = [self managedObjectContext];
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] initWithEntityName:@"MonitorItem"];
    self.monitorItemArray = [[managedObjectContext
                              executeFetchRequest:fetchRequest
                              error:nil] mutableCopy];

NSLog(@"viewDidLoad.monitorItemArray[1].validity: %d", (int)[self.monitorItemArray[1] valueForKey:@"validity"]);

}

the result from the NSLog is shown below:

2014-05-14 14:55:15.939 SGRecencyMonitor[3086:70b] viewDidLoad.monitorItemArray[1].validity: 1442

As shown the value should be 90 instead of 1442. However a check on the cellForRowAtIndexPath method below returns correct result:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

NSManagedObject *monitorItem = [self.monitorItemArray objectAtIndex:indexPath.row];

//
// code to display each row here
//
    NSLog(@"ItemViewController tableview cellForRowAtIndexPath Validity: %@", [monitorItem valueForKey:@"validity"]);

    return cell;
}

the result is as follow:

2014-05-14 14:55:15.948 SGRecencyMonitor[3086:70b] ItemViewController tableview cellForRowAtIndexPath Validity: 90

Can someone please explain to me why I cannot get the correct result using [self.monitorItemArray[1] valueForKey:@"validity"] I am using this method to pass the object self.monitorItemArray to another view. I can't retrieve the correct values through it. Below is the segue method

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"UpdateView"])
    {
        NSManagedObject *selectedItem = [self.monitorItemArray objectAtIndex:[[self.tableView indexPathForSelectedRow] row]];
        ItemUpdateViewController *destViewController = segue.destinationViewController;
        destViewController.ItemReceived = selectedItem;
    }
}

What have I done wrong? Thank you

Upvotes: 0

Views: 74

Answers (2)

jrturton
jrturton

Reputation: 119292

In the first instance you're using %d as a format specifier - this expects an integer, but you pass it an NSNumber, which is an object. You're seeing the integer of the object's memory address. In the second instance you're using %@, which expects an object, and you're seeing the result of the NSNumber's description method, which just prints out the number value.

Either change the first format specifier to %@ or pass in the integerValue from the number object.

Upvotes: 1

nmh
nmh

Reputation: 2503

Try this: 

- (void)viewDidLoad
{
NSManagedObjectContext *managedObjectContext = [self managedObjectContext];
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] initWithEntityName:@"MonitorItem"];
self.monitorItemArray = [[managedObjectContext
                          executeFetchRequest:fetchRequest
                          error:nil] mutableCopy];

NSNumber *n = [self.monitorItemArray[1]     valueForKey:@"validity"];
NSLog(@"viewDidLoad.monitorItemArray[1].validity: %d", [n intValue]);
}

// it works for me

Upvotes: 0

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