CODEWITHSUNDEEP
ioscore-datadevicensfetchedresultscontroller
whitehead1415
whitehead1415

Reputation: 435

Core Data fetchedresultscontroller returns empty on device only

I Wrote an application that uses core data and it was working fine, on both simulator and devices. Then I made a new git branch of the project and it works perfectly on the simulator but not on the devices.

Here is the code for the fetchedResultsController

-(NSFetchedResultsController *)fetchedResultsController{
    if (_fetchedResultsController != nil) {
        NSLog(@"Fetched Controler : %@", _fetchedResultsController);
        return _fetchedResultsController;
    }
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"Membership" inManagedObjectContext:managedObjectContext];
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"userdata.email == %@",    [[NSUserDefaults standardUserDefaults] stringForKey:@"email"]];    
    NSSortDescriptor *sort1 = [[NSSortDescriptor alloc]initWithKey:@"type" ascending:NO];
    NSSortDescriptor *sort2 = [[NSSortDescriptor alloc]initWithKey:@"membership_name" ascending:YES];
    NSArray *sortDescriptors = [[NSArray alloc]initWithObjects:sort1,sort2, nil];
    [fetchRequest setEntity:entity];
    [fetchRequest setPredicate:predicate];
    [fetchRequest setSortDescriptors:sortDescriptors];

    _fetchedResultsController = [[NSFetchedResultsController alloc]initWithFetchRequest:fetchRequest managedObjectContext:managedObjectContext sectionNameKeyPath:@"type" cacheName:nil];
    return _fetchedResultsController;
}

Then I fetch the objects in view will apear.

-(void)viewWillAppear:(BOOL)animated{
    NSError *error;
    [[self fetchedResultsController]performFetch:&error];
    [self.tableView reloadData];
}

The managed object context is passed from appDelegate to the login view then from the loginView to the second view. On the second view is where I am having problems

The only thing that I can think of is that something is happening with the memory limitations on the device or maybe a concurrency issue?
If there are are any threads created I did not mean to do it.

Upvotes: 0

Views: 253

Answers (1)

Mundi
Mundi

Reputation: 80265

It seems that your predicate

NSPredicate *predicate = 
   [NSPredicate predicateWithFormat:@"userdata.email == %@",    
   [[NSUserDefaults standardUserDefaults] stringForKey:@"email"]];

is returning an empty set. Log the value of this user default and I am convinced this will be cleared up.

Upvotes: 1

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