Access value of an entity attribute - ios

Question

I have a Core Data to-many relationship that looks like this:
Athlete(evals)<->>Eval(whosEval)
I have a table view for Athletes which displays ALL the Athletes in the database. I want to set the subtitle text to a Eval attribute, let's say it is called "date_recorded" the problem is, there could be more than 1 eval for each Athlete. I need to select the last object in the evalArray, and then display the correlating Eval attribute for each Athlete, so each Athlete's subtitle text will probably be different. How would I do this for every cell in my table? Here is what i've got so far:
allathletes.m
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Athlete Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
Athlete *athlete = (Athlete *)[athleteArray objectAtIndex:indexPath.row];
cell.textLabel.text =[athlete full];
cell.detailTextLabel.text = //eval attribute "date_recorded"
AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
_managedObjectContext = [appDelegate managedObjectContext];
NSFetchRequest *request = [[NSFetchRequest alloc] init];
NSFetchRequest *athleteRequest = [[NSFetchRequest alloc] init];
[athleteRequest setEntity:[NSEntityDescription entityForName:#"Athlete" inManagedObjectContext:_managedObjectContext]];
NSError *athleteError = nil;
NSPredicate *athletePredicate = [NSPredicate predicateWithFormat:#"full == %#", athlete.full];
[athleteRequest setPredicate:athletePredicate];
NSArray *results = [_managedObjectContext executeFetchRequest:athleteRequest error:&athleteError];
Athlete *currentAthlete = [results objectAtIndex:0];
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"whosEval == %#", currentAthlete];
[request setPredicate:predicate];
NSEntityDescription *eval = [NSEntityDescription entityForName:#"Eval" inManagedObjectContext:_managedObjectContext];
[request setEntity:eval];
NSSortDescriptor *sortDescriptor =
[[NSSortDescriptor alloc] initWithKey:#"date_recorded"
ascending:NO
selector:#selector(localizedCaseInsensitiveCompare:)];
NSArray *sortDescriptors = [[NSArray alloc]initWithObjects:sortDescriptor, nil];
[request setSortDescriptors:sortDescriptors];
NSError *error = nil;
NSMutableArray *mutableFetchResults = [[_managedObjectContext executeFetchRequest:request error:&error] mutableCopy];
if (mutableFetchResults == nil){
//handle error
}
NSMutableArray *lastEvalArray = mutableFetchResults;
Eval *lastEval = lastEvalArray.lastObject;
cell.detailTextLabel.text = lastEval.date_recorded;
return cell;
}

Answer 1

If date_recorded is an NSDate attribute, then you can just do
Athlete *athlete = (Athlete *)[athleteArray objectAtIndex:indexPath.row];
NSDate *lastRecorded = [athlete valueForKeyPath:#"#max.evals.date_recorded"];
and then use a NSDateFormatter to convert lastRecorded to an NSString and
assign it to cell.detailTextLabel.text.