NSManagedObjectContext not updating correctly

Question

hi :) I have a similar problem, for example, in Working with the same NSManagedObjectContext on several tabs
background:
My managedObjectContext (hereinafter MOC) is initialized in my appDelegate class and passed through tt to several tabs using myViewController.managedObjectContext = self.managedObjectContext;or in the init method with self.managedObjectContext = pContext; stream: first view is a simple list of collections. Collections are retrieved using NSFetchedResultsController ( myViewController : UITableViewController<NSFetchedResultsControllerDelegate>). By choosing one of them, you move deeper, but still skip this MOC.
In the next controller (detailViewController), I list some elements of this collection that I can interact with (for example, to set radio buttons).
I also have editObjectContext:

// DetailsViewController.m
NSManagedObjectContext* editingContext = [[NSManagedObjectContext alloc] init];
[editingContext setPersistentStoreCoordinator:[managedObjectContext persistentStoreCoordinator]];
self.editingObjectContext = editingContext;

Now my problem is: because my opinion has to spin, I use the following trick:

// DetailsViewController.m
DetailsView *localAct = [[DetailsView alloc] initWithManagedObjectContext:managedObjectContext ... ]
DetailsView *localSen = [[DetailsView alloc] initWithManagedObjectContext:managedObjectContext ... ]

UITableView *localContainerView = [[UITableView alloc] init];
self.containerView = localContainerView;
[localContainerView release];
//[...]
[containerView addSubview:actuatorView];
self.tableView = containerView;

further, I have a button for controlling these elements (which of them should be shown and which should not). This button simply reloads the table with the new fetchResult.

// DetailsView.m
- (void) manageItems{
managing = !managing;
[viewController setIsManaging:managing]; // parent
self.fetchedResultsController = nil;

NSError *error = nil;
[[self fetchedResultsController] performFetch:&error];

[self reloadData];
[self updateBarButton];
}

The method for placing elements in context looks like this:

// DetailsViewController.m
(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
// init + create predicate
NSSet* set = [sen filteredSetUsingPredicate:predicate];
if( [set count] > 0 )
{
    for( Act* act in set )
    {
        [editingObjectContext deleteObject:act];
    }
}
else
{
    Act* act = [NSEntityDescription insertNewObjectForEntityForName:@"Act" inManagedObjectContext:editingObjectContext];

    // do things
}
NSError *error = nil;
[[detailView fetchedResultsController] performFetch:&error];

[self.containerView reloadData];
[detailView reloadData];
}

but after I selected the elements in the managed view and click save (manageItems), the view does not show them: / I need to switch the tab or switch to another controller (parent or deeper) to implement it, my ViewWillAppear method:

// DetailsViewController.m
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
DetailsView *detailView = se ? senView : actView;
// [do uninteresting stuff]
[detailView.fetchedResultsController performFetch:nil];
[self.tableView reloadData];
// [do uninteresting stuff]
}

and viewWillDisapper calls

- (void)saveChanges
{
if( ![editingObjectContext hasChanges] )
    return;

// send save-command to server
}

Verison, , , ...:/ , MOC , . "manageItems" , ( DetailsView )...

- , ( , , . self.tableView/detailView/self.containerView refresh :/).

: "editObjectContext save:" , .

handleChangeResponse: Error Domain = NSCocoaErrorDomain Code = 133020 " . (Cocoa 133020.)" UserInfo = 0x4d8bb90 {conflictList = (      "NSMergeConflict (0x5a2fac0) NSManagedObject (0x5a46a80) " 0x5a46420 " oldVersion = 7 newVersion = 8 = {\n iconName = noicon;\n [...];\n} = {\n iconName = noicon;\n [...]\n}" )}

(, ), :)

:)

Answer 1

, ! IOS 5.0 NSManagedObjectContext:

[managedObjectContext setMergePolicy:NSMergeByPropertyStoreTrumpMergePolicy];

http://pauloliveira.net/tech/core-data-merging-conflicts
MOC ( appDelegate) - ! ;)

Answer 2

, ... , ... fetchrequest - : ...

[NSComparisonPredicate predicateWithLeftExpression: ...] 

NSString * predicateFormat = [NSString stringWithFormat: ...];
NSPredicate* predicate = [NSPredicate predicateWithFormat:predicateFormat];

, , ( ( MOC, ), , DetailsViewController :/).
> , : D

, ( ). , , :/

Answer 3

This may be due to the controlling context of using the object, where u'r gets it. Remove all NSManagebobject while you are either logging out or going back. let's say the end using the app. Sounds like this ...

[NSManagebobjectcontext setManagedObjectsDictionary:[NSMutableDictionary dictionary]];