Core Data returning NSArrays instead of NSStrings

For some reason all of the NSString typed attributes are being returned as NSArrays in my Article object. Here's my function to retrieve them:

- (NSArray *)getSavedArticles
{
    NSFetchRequest *fetchRequest = [[[NSFetchRequest alloc] init] autorelease];
    NSError *error = nil;
    NSEntityDescription *entity = [NSEntityDescription 
                                   entityForName:@"Article" inManagedObjectContext:[self managedObjectContext]];
    [fetchRequest setEntity:entity];
    NSSortDescriptor *dateSort = [NSSortDescriptor sortDescriptorWithKey:@"last_opened" ascending:NO];
    [fetchRequest setSortDescriptors:[NSArray arrayWithObject:dateSort]];
    NSArray *fetchedObjects = [[self managedObjectContext] executeFetchRequest:fetchRequest error:&error];
    return fetchedObjects;
}

I have not created a NSManagedObjectModel for these, and instead I'm just accessing them using KVO.

//self.data has the array returned from getSavedArticles
NSManagedObject *object = [self.data objectAtIndex:indexPath.row]; 
NSString *path  = [object valueForKey:@"path"];
NSString* id      = [object valueForKey:@"id"];

When I look at this in the variables pane, on path and id I see (__NSArrayI *) ... Variable is not a CFString. Printing the description of either of these also prints out the parenthesis used when printing arrays.

I'm just wondering if this could be due to the sort descriptor? I have double checked that the data going into these objects is typed correctly, and the SQLite database that I'm using to backup everything is displaying strings.

I have tried re-installing the app in the simulator, and resetting it. I still get a NSArray instead of a NSString.

I really don't know what's going on here. Any help would be appreciated.

EDIT: I just found something else interesting. I do another check to see if an Article has been saved, and this time I don't get a NSArray for the article path:

- (NSString *)hasArticleSaved:(NSString *)id
{
    NSString *path = nil;
    NSFetchRequest *fetchRequest = [[[NSFetchRequest alloc] init] autorelease];
    [fetchRequest setPredicate:[NSPredicate predicateWithFormat:@"%K == %@", @"id", id]];
    NSEntityDescription *entity = [NSEntityDescription 
                                   entityForName:@"Article" inManagedObjectContext:[self managedObjectContext]];
    [fetchRequest setEntity:entity];
    NSError *error = nil;
    NSArray *fetchedObjects = [[self managedObjectCont开发者_如何学Cext] executeFetchRequest:fetchRequest error:&error];
    if (fetchedObjects.count > 0) {
       NSManagedObject *savedArticle = [fetchedObjects objectAtIndex:0];
        path = [savedArticle valueForKey:@"path"];
    }
    return path;
}

Now I'm really confused. Any takers?

---

Your problem is here:

[self.data objectForKey:indexPath.row]

...because objectForKey: is looking for a string key name e.g. "path" or "id". Giving it an integer will produce an error or a random return.

Instead, you want:

[self.data objectAtIndex:indexPath.row]

... which will return the managed object at the given index in the array.

---

I found the issue. I had changed the data structure for my table so self.data is an array of arrays...and with only 1 object it looked like I was getting a NSArray back when in fact I was just accessing the data wrong. I just needed to do [[self.data objectAtIndex:indexPath.section] objectAtIndex:indexPath.row];