/**
 Returns the managed object model for the application.
 If the model doesn't already exist, it is created by merging all of the models found in the application bundle.
 */
- (NSManagedObjectModel *)managedObjectModel {

    if (managedObjectModel != nil) {
        return managedObjectModel;
    }
    managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:nil] retain];

    // Find the fetched properties, and make them sorted...
    for (NSEntityDescription *entity in [managedObjectModel entities]) {
        for (NSPropertyDescription *property in [entity properties]) {
            if ([property isKindOfClass:[NSFetchedPropertyDescription class]]) {
                NSFetchedPropertyDescription *fetchedProperty = (NSFetchedPropertyDescription *)property;
                NSFetchRequest *fetchRequest = [fetchedProperty fetchRequest];

                // Only sort by name if the destination entity actually has a "name" field
                if ([[[[fetchRequest entity] propertiesByName] allKeys] containsObject:@"name"]) {
                    NSSortDescriptor *sortByName = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES];
                    [fetchRequest setSortDescriptors:[NSArray arrayWithObject:sortByName]];
                    [sortByName release];
                }
            }
        }
    }

    return managedObjectModel;
}

NSFetchRequest* request = [[NSFetchRequest alloc] init];
NSEntityDescription* entity = [NSEntityDescription entityForName:@"whatYouAreLookingFor"
    inManagedObjectContext:self.managedObjectContext];
[request setEntity:entity];

// here's where you specify the sort
NSSortDescriptor* sortDescriptor = [[NSSortDescriptor alloc]
                                initWithKey:@"name" ascending:YES];
NSArray* sortDescriptors = [[[NSArray alloc] initWithObjects: sortDescriptor, nil] autorelease];
[request setSortDescriptors:sortDescriptors];
[sortDescriptor release];

fetchedResultsController = [[NSFetchedResultsController alloc]
               initWithFetchRequest:request
               managedObjectContext:self.managedObjectContext
                 sectionNameKeyPath:nil
                          cacheName:@"myCache"];

@property NSString *stringIsaNumber; // in the data model
@property NSNumber *number;

@dynamic stringIsaNumber;
- (NSNumber *) number ;
{ return [self.stringIsaNumber numberFromString]; }
- (void) setNumber:(NSNumber *)value;
{ self.stringIsaNumber = [NSString stringWithFormat:@"%5i",value) }