NSFetchedResultsController - How to show the right sections rows in cellForRowAtIndexPath - ios

Question

I have a list of countries and venues read in by JSON. It now reads in correctly and seems to store relationships.
// Read JSON
NSString *jsonPath = [[NSBundle mainBundle] pathForResource:#"venues" ofType:#"json"];
NSData *data = [NSData dataWithContentsOfFile:jsonPath];
id json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
if (error) {
NSLog(#"Error - %#", error);
} else {
//NSLog(#"JSON = %#", json);
dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
/*
"USA": [
{
"venue": "Von Braun Center",
"city" : "Huntsville",
"state": "Alabama",
"capacity": 13760
},
*/
for (NSDictionary *dict in json) {
NSString *name = (NSString *) [dict objectForKey:#"name"];
NSArray *venueList = (NSArray *) [dict valueForKey:#"venues"];
[MagicalRecord saveInBackgroundWithBlock:^(NSManagedObjectContext *c) {
Country *country = [Country createInContext:c];
[country setName:name];
NSMutableArray *listOfVenues = [NSMutableArray array];
NSLog(#"Country - %#", country.name);
for (NSDictionary *venueData in venueList) {
NSString *name = (NSString *) [venueData objectForKey:#"venue"];
NSString *city = (NSString *) [venueData objectForKey:#"city"];
NSString *state = (NSString *) [venueData objectForKey:#"state"];
//NSNumber *capacity = (NSNumber *) [NSNumber numberWithInt:[[venueData valueForKey:#"capacity"] intValue]];
Venue *v = [Venue createInContext:c];
[v setName:name];
[v setCity:city];
[v setState:state];
[v setCountry:country];
[listOfVenues addObject:v];
NSLog(#"Venue - %#, %#", v.name, v.country.name);
} // next
[country setVenues:[NSSet setWithArray:listOfVenues]];
} completion:^{
}];
} // next
dispatch_async(dispatch_get_main_queue(), ^{
[[NSManagedObjectContext defaultContext] saveNestedContexts];
NSUInteger entities = [Venue countOfEntities];
NSLog(#"Venues saved = %d", entities);
});
});
} // end if
This produces a log of venues, like this;
Loading venue data...
Country - USA
Venue - Von Braun Center, USA
Venue - Birmingham Convention Center, USA
Country - UK
Venue - O2 Arena, UK
Venue - MEN Arena, UK
So far so good.
But when I get to the actual Venue view it simply displays the venues in alphabetical order but it does displays the section at their correct
My code is;
// viewDidLoad
self.fetchedResultsController = [Venue fetchAllGroupedBy:#"country.name" withPredicate:nil sortedBy:#"name" ascending:YES];
#pragma mark - Table View
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return [[self.fetchedResultsController sections] count];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [[[self.fetchedResultsController sections] objectAtIndex:section] numberOfObjects];
}
-(NSString*)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
id <NSFetchedResultsSectionInfo> sectionInfo = [[self.fetchedResultsController sections] objectAtIndex:section];
return [sectionInfo name];
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tv cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tv dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
[self configureCell:cell atIndexPath:indexPath];
return cell;
}
- (void)configureCell:(UITableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath {
Venue *v = [self.fetchedResultsController objectAtIndexPath:indexPath];
cell.textLabel.text = v.name;
}
What this produces on the screen is the following;
I have tried resetting the app and its data to no avail.
Screenshot (via Imageshack)
As you can see, the list is just alphabetical and not correct and not split up across the relevant sections.
It seems to stem from the
Venue *v = [self.fetchedResultsController objectAtIndexPath:indexPath];
line but I am not sure how to fix it.
I am wondering what I am doing wrong and how I can fix it so that it is displaying the correct data in the correct section.

Answer 1

After setting the country for a venue
[v setCountry:country];
this line is redundant and might break your relationships
[country setVenues:[NSSet setWithArray:listOfVenues]];
You only have to set the relationship once. The reverse relationship is generated automatically.

Answer 2

I was able to put the sections in the right groups (ie: USA venues now belong to the USA country)
self.fetchedResultsController = [Venue fetchAllGroupedBy:#"country.name" withPredicate:nil sortedBy:#"country.name" ascending:YES delegate:self inContext:managedObjectContext];
But now what is happening is that the venues are not ordered by name ascending.
I get a list like this;
Screenshot:
http://img443.imageshack.us/img443/340/6f3o.png
The venues are now grouped to countries, but the venues themselves are not ordered in A-Z.
I would like my venues to be arranged in A-Z and the countries would not be ordered.
But I am not sure how to do this.