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POFilter NSFetchedResultsController to remove objects with same name
 

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  1. POFilter NSFetchedResultsController to remove objects with same name
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    <p>I have these objects that are unique except for two columns once of which I am using as the display in the UITableView. The UITableView will often show duplicates due to this. I need to filter out these duplicates somehow. </p> <p>Setting distinctResult on the FetchResult won't work in this case since that limits the functionality of the NSFetchedResultsController and it requires that the REsultType be a NSDictionary instead of a subclass of managed object. </p> <p>Doesn't anyone have any idea how I can filter these duplicates out using a predicate?? Remember that every field on these objects is unique except for two of them. </p> <pre><code>-(NSFetchedResultsController *) fetchGroupedObjects:(NSString *)entityDescription sortField:(NSString *)sortField withPredicate:(NSPredicate *)predicate { BPRAppDelegate *delegate = (BPRAppDelegate *)[UIApplication sharedApplication].delegate; NSManagedObjectContext *context = delegate.managedObjectContext; //NSError *error; //Fetch the data.... NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:entityDescription inManagedObjectContext:context]; [fetchRequest setEntity:entity]; NSSortDescriptor *groupDescription = [[NSSortDescriptor alloc] initWithKey:GROUP_NAME ascending:YES]; //Sort by Category Name NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:sortField ascending:YES]; NSMutableArray *sorts = [[[NSMutableArray alloc] init] autorelease]; [sorts addObject:sortDescriptor]; [sorts addObject:groupDescription]; [fetchRequest setSortDescriptors:sorts]; //[fetchRequest setResultType:NSDictionaryResultType]; //[fetchRequest setPropertiesToGroupBy:[entity.propertiesByName valueForKey:CONTRACTOR_NAME]; if (predicate != nil) [fetchRequest setPredicate:predicate]; //NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&amp;error]; //NSFetchResultsController [fetchRequest setFetchBatchSize:20]; NSFetchedResultsController *fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:context sectionNameKeyPath:GROUP_NAME cacheName:nil]; //Don't use a cache [fetchRequest release]; [sortDescriptor release]; [groupDescription release]; return fetchedResultsController; //You can't autorelease this thing... the requestor must do that. </code></pre> <p>}</p>
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    1. USchrislhardin
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      1. USbrush51
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    1. COId love to help you out. But I need more details about the entities you want to filter. Whats the entity called, and what fields does it have - and which of those are dupe?
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      1. USEmmanuel Ay
 

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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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