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PONSFetchedResultsController do not get updated when the managedobjectcontext change
 

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  1. PONSFetchedResultsController do not get updated when the managedobjectcontext change
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    <p>I make a program where I sometimes moves some anchor to another</p> <p>When I move those anchors I would recompute distance of bizs nearby the 2 anchors (before and after anchors). The computation is done in background</p> <p>I used this standard code to update stuff</p> <pre><code>+(void)commit { // get the moc for this thread [Tools breakIfLock]; NSManagedObjectContext *moc = [self managedObjectContext]; NSThread *thread = [NSThread currentThread]; DLog(@"threadKey commit%@" , [[self class]threadKey]); if ([thread isMainThread] == NO) { // only observe notifications other than the main thread [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(contextDidSave:) name:NSManagedObjectContextDidSaveNotification object:moc]; } NSError *error; if (![moc save:&amp;error]) { CLog(@"Error in Saving %@", error); DLog(@"What the hell error is it"); } else{ } if ([thread isMainThread] == NO) { [[NSNotificationCenter defaultCenter] removeObserver:self name:NSManagedObjectContextDidSaveNotification object:moc]; } //[GrabClass StopNetworkActivityIndicatorVisible]; } +(void)contextDidSave:(NSNotification*)saveNotification { dispatch_async(dispatch_get_main_queue(), ^{ BadgerNewAppDelegate *delegate = [BNUtilitiesQuick appDelegate]; DLog (@"currentThreadinContextDidSave: %@",[self threadKey]); NSManagedObjectContext *moc = delegate.managedObjectContext; //delegate for main object CLog(@"saveNotification : %@",saveNotification); [moc mergeChangesFromContextDidSaveNotification:saveNotification]; }); //[moc performSelectorOnMainThread:@selector(mergeChangesFromContextDidSaveNotification:) withObject:saveNotification waitUntilDone:YES]; } </code></pre> <p>I break point and see that distances did get updated. Everything is fine</p> <p>However the <code>NSFetchedResultsController</code> fetchedObjects doesn't seem to get updated and still use the old value.</p> <p>How can that be?</p> <p>Also the </p> <pre><code>- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller { DLog(@"controllerWillChangeContent: %@", controller); [self.tableViewA beginUpdates]; } </code></pre> <p>is never called even though the <code>NSManagedObjectContext</code> has changes.</p> <p>Well actually I wasn't sure if the <code>managedObjectContext</code> has changed or not. How do I know? I mean will change in managedObjectContext ensure changes in <code>fetchController.fetchedObjects</code>.</p> <p>There is no caching as far as I know. How can I be sure of that too?</p>
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    1. USLorenzo B
    1. USJ. Chang
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      1. USRickster
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    1. COJust to check: did you set the NSFetchedResultsController's delegate?
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      1. USMark Leonard
    2. COyes of course. it's often called too.
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      1. USJ. Chang
 

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