Accessing property without self.propertyname cause errors - objective-c

Question

I'm working on App with coreData and i get an error that i can't understand: In a custom init whether i define NSFetchedResultController with "self.controller = new_controller" all works correctly, if i define only "controller = new_controller" (without self), error "The NSManagedObject has been invalidated" occur after 2 loops for the situation described in this image:
Application parts interested in this error is here described:
A Table with a list of Months (Class MonthListVC, step 1 in the image). Where
sections describe Month (like April
2011) and the unique Row for any
section present data (that are sum
from transactions happened during the
month).
Selecting one of these Row a next
Table is pushed in navigation
controller (Class WeekTVC, step 2 in the image), this table presents
detail for every weeks for selected month. Here section title has format "week beginning - week end", and the unique row for the section is a sum of transactions for the week.
A NSManagedObjectContext is passed via a custom init method (check the code)
every data for these tables are managed with
NSFetchedResultController.
Here the code for selection on first Table (MonthListVC)
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
id <NSFetchedResultsSectionInfo> sectionInfo = [[self.controller sections] objectAtIndex:indexPath.section];
// get the first object for this section and get its date.
NSDate *datepoint = [[[sectionInfo objects]objectAtIndex:0] date];
//Create next Controller and push it into Navigation
WeeksTVC *weeksTVC = (WeeksTVC*)[[WeeksTVC alloc] initWithContext:self.context datepoint:datepoint withTitle: [sectionInfo name] ];
[self.navigationController pushViewController:weeksTVC animated:YES];
[weeksTVC release];
}
And here the code for WeeksTVC custom init method, where i define "self.controller = ..." and where i get the problem whether i write only "controller = ...".
"controller" is a synthesized property.
-(WeeksTVC *)initWithContext:(NSManagedObjectContext *)n_context datepoint:(NSDate*)n_datePoint withTitle:(NSString*) stringTitle{
self = [self init];
if(self !=nil){
self.title = [NSString stringWithFormat:#"History (%#)",stringTitle];
//Back button setup
UIBarButtonItem *barButton = [[UIBarButtonItem alloc] init];
barButton.title = #"Back";
self.navigationItem.backBarButtonItem = barButton;
//datePoint = n_datePoint;
self.context = n_context;
//Get Begin and End week information for this datePoint
NSDate *startDay = [[CommonHelper weekInfoFromData:[CommonHelper firstDayOfMonthForDate:n_datePoint]] objectForKey:#"begin"];
NSDate *endDay = [[CommonHelper weekInfoFromData:[CommonHelper lastDayOfMonthForDate:n_datePoint]] objectForKey:#"end"];
//Manage Request
NSFetchRequest *request = [[NSFetchRequest alloc]init];
request.entity = [NSEntityDescription entityForName:#"Transactions" inManagedObjectContext:self.context];
request.predicate = [NSPredicate predicateWithFormat:#"(date >= %#) && (date <= %#)",startDay,endDay];
NSSortDescriptor *sort = [NSSortDescriptor sortDescriptorWithKey:#"date" ascending:NO];
NSArray *sortDescs = [NSArray arrayWithObjects:sort,nil];
request.sortDescriptors = sortDescs;
"HERE THE PROBLEM WITH SELF***********************************************"
//Manage NSResultFetchedController
self.controller = [[NSFetchedResultsController alloc] initWithFetchRequest:request managedObjectContext:self.context sectionNameKeyPath:#"byWeek" cacheName:nil];
self.controller.delegate = self;
NSError *error = nil;
//Fetch
[self.controller performFetch:&error];
"END OF PROBLEM***********************************************************"
[request release];
[barButton release];
}
return self;
}
I report also dealloc method for WeeksTVC, i found that if i don't release context and controller in this method... no error occur also if i write in init method "controller = " and not "self.controller = "
- (void)dealloc {
//[self.datePoint release];
[self.controller release];
[self.context release];
[super dealloc];
}
Why self.controller and controller are so different in this case ???
In init method i ever write ivar without self -.-'

Answer 1

In custo init method for WeeksTVC i wrote
self = [self init];
and not
self = [super init];
This cause the problem... but i'm curious to understand what happen exactly...