Databases
StackOverflow2013
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PO
 

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    <p>I think I may have found the error, since I changed it I haven't experienced the problem so I am assuming that it's ok.</p> <p>In my implementation of <code>controller:didChangeObject:atIndexPath:forChangeType:newIndexPath:</code> I had this in the switch statement for <code>NSFetchedResultsChangeMove</code>:</p> <pre><code>case NSFetchedResultsChangeMove: [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade]; // Reloading the section inserts a new row and ensures that titles are updated appropriately. [tableView reloadSections:[NSIndexSet indexSetWithIndex:newIndexPath.section] withRowAnimation:UITableViewRowAnimationFade]; break; </code></pre> <p>As it was used in an older project (which I was not part of), I assumed the entire <code>controller:didChangeObject:atIndexPath:forChangeType:newIndexPath:</code> implementation was okay, since this really is more of a template rather then something you will do anything customised. </p> <p>In consequence I didn't pay much attention to it until I was reading up about it again on the Apple developer site. And I noticed, in case of a <code>NSFetchedResultsChangeMove</code> you must delete a cell, and insert the cell at the new path. Yet I had implemented without really realising - delete the cell and reload the section !</p> <p>In effect I should and now have the following:</p> <pre><code>case NSFetchedResultsChangeMove: [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade]; [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath] withRowAnimation:UITableViewRowAnimationFade]; break; </code></pre> <p>Like I said I've not had a problem since. Would love to know from anyone what inner workings would be responsible for this - the exception having been "Attempt to create two animations for cell".</p> <p>Thanks for any interest.</p>
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    1. COYou saved my day, thank you!
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    2. COI guess there's some tutorial or source code out there we both copied and used. Since this is boilerplate stuff... Apple also has the (correct) implementation here http://developer.apple.com/library/ios/#documentation/CoreData/Reference/NSFetchedResultsControllerDelegate_Protocol/Reference/Reference.html
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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