Array goes empty in DidSelectRowAtIndexPath - iphone

Question

I have in my coreDatabase an entity "Day". In a method I fetch the data from that entity and put it in a mutuableArray dayObjects. You can see the code over here.
NSManagedObjectContext *context = [RKManagedObjectStore defaultStore].persistentStoreManagedObjectContext;
NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:#"Day"];
NSPredicate *predicate = [NSPredicate predicateWithFormat:
#"p_date >= %# and p_date <= %#",dateString,dateString2];
[fetchRequest setPredicate:predicate];
NSSortDescriptor *descriptor = [NSSortDescriptor sortDescriptorWithKey:#"p_id" ascending:YES];
fetchRequest.sortDescriptors = #[descriptor];
NSArray *matches = [context executeFetchRequest:fetchRequest error:nil];
NSLog(#"matches = %#",[matches valueForKey:#"p_date"]);
arrDateObjects = [matches mutableCopy];
In my cellForRow I do this
Day *objDay = [arrDateObjects objectAtIndex:indexPath.row-1];
Cell.titlelabel.text = day.p_from;
In my tableview the data is showed correctly. The problem is dat when I do the same thing in my DidSelectRowAtIndexPath. I always get a Null when I log day.p_from.
Can anybody help me ?
EDIT
My numberOfSections
(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
int sections = 0;
sections = 1;
return sections;
}
My numberOfRowsInSection
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
int rows = 0;
rows = 8; //showing 7 days + 1 row for a little title
return rows;
}
My CellForRowAtIndexPath
static NSString *simpleTableIdentifier = #"OpeningCell";
OpeningCell *cell = (OpeningCell *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:#"OpeningCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
}
if(indexPath.row == 0){
cell.lblDay.text = NSLocalizedString(#"lblDag", nil);
cell.lblFrom.text = NSLocalizedString(#"lblVan", nil);
cell.lblTill.text = NSLocalizedString(#"lblTot", nil);
}else{
Day *objDay = [arrDateObjects objectAtIndex:indexPath.row-1];
NSLog(#"Day object in cell from = %#",objDay.p_from);
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"YYYY-MM-dd"];
NSDate *date = [dateFormat dateFromString:objDay.p_date];
NSDateFormatter *dateFormat2 = [[NSDateFormatter alloc] init];
[dateFormat2 setDateFormat:#"dd/MM"];
NSString *dateString = [dateFormat2 stringFromDate:date];
NSLog(#"date: %#", dateString);
cell.lblShort.text = dateString;
cell.lblDay.text = [arrDays objectAtIndex:indexPath.row-1];
NSString *txtFrom = [objDay.p_from substringWithRange:NSMakeRange(0, 5)];
cell.lblFrom.text = txtFrom;
NSString *txtTill = [objDay.p_till substringWithRange:NSMakeRange(0, 5)];
cell.lblTill.text = txtTill;
}
return cell;

Answer 1

NSLog(#"matches = %#",[matches valueForKey:#"p_date"]);
arrDateObjects=[[NSMutableArray alloc]init];
[arrDateObjects addobject:[matches objectAtindex:indexpath.row-1]];
Instead of
NSLog(#"matches = %#",[matches valueForKey:#"p_date"]);
arrDateObjects = [matches mutableCopy];

Answer 2

//try
arrDateObjects = [NSMutableArray arrayWithArray:matches];
//instead of
arrDateObjects = [matches mutableCopy];