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POManaged Object Removed from Fetched Results For No Reason
 

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  1. POManaged Object Removed from Fetched Results For No Reason
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    <p>I've got an odd problem that I can't figure out. I have a fairly typical <code>UIViewController</code> with a <code>UITableView</code> and an <code>NSFetchedResultsController</code> fetching objects from an SQLite store. The fetching works fine and the table works fine, with typical <code>NSFetchedResultsController</code> boilerplate:</p> <pre><code>-(void)controllerWillChangeContent:(NSFetchedResultsController *)controller{ [self.tableView beginUpdates]; } -(void)controller:(NSFetchedResultsController *)controller didChangeSection:(id&lt;NSFetchedResultsSectionInfo&gt;)sectionInfo atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type{ if(type==NSFetchedResultsChangeInsert){ [self.tableView insertSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade]; } else if(type==NSFetchedResultsChangeDelete){ [self.tableView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade]; } } -(void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type newIndexPath:(NSIndexPath *)newIndexPath{ UITableView *tV = self.tableView; if(type==NSFetchedResultsChangeInsert){ [tV insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath] withRowAnimation:UITableViewRowAnimationFade]; } else if(type==NSFetchedResultsChangeDelete){ [tV deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade]; } else if(type==NSFetchedResultsChangeUpdate){ [self configureCell:[tV cellForRowAtIndexPath:indexPath] atIndexPath:indexPath]; } else if(type==NSFetchedResultsChangeMove){ [tV deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade]; [tV insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath] withRowAnimation:UITableViewRowAnimationFade]; } } -(void)controllerDidChangeContent:(NSFetchedResultsController *)controller{ [self.tableView endUpdates]; } </code></pre> <p>The problem I'm having is that objects with any relationships that are nil (even if the relationship property is not involved in the fetch request in either the predicate or sort descriptors) disappear from the fetched results (<code>controller:didChangeObject:</code> gets called with <code>NSFetchedResultsChangeDelete</code>) any time they are updated in any way (changing an unrelated property for instance). If I re-perform the fetch, the object will be back.</p> <p>This happens even if I don't use a predicate in the fetch request.</p> <p>Does anybody have any idea what might be going on here?</p>
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    1. This table or related slice is empty.
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    1. USThe iOSDev
    1. USAndrew M
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
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      1. POManaged Object Removed from Fetched Results For No Reason
      1. USAndrew M
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    1. COthere's always a reason, there is nothing like code treason =D
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      1. UStGilani
    2. COThanks for the rhyme?
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      1. POManaged Object Removed from Fetched Results For No Reason
      1. USAndrew M
    3. COYou should add a description of your entities/attributes/relationships, and also show the code how you create the fetched results controller.
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      1. POManaged Object Removed from Fetched Results For No Reason
      1. USMartin R
 

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