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iPhone core data problem : referenceData64 only defined for abstract class


iPhone core data problem : referenceData64 only defined for abstract class

By : Muhammad Tanveer
Date : October 16 2020, 11:12 PM
hope this fix your issue I had the same problem with core data and multithreading operations. Read this article for understanding of the problem.
In the working thread I began to use the functions lock, unlock for NSManagedObjectContext and crash not repeat any more.
code :


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Cryptic error from Core Data: NSInvalidArgumentException, reason: referenceData64 only defined for abstract class

Cryptic error from Core Data: NSInvalidArgumentException, reason: referenceData64 only defined for abstract class


By : user1035
Date : March 29 2020, 07:55 AM
should help you out I have the same issue. It works for smaller data sets, but for larger sets I get "_referenceData64 only defined for abstract class" errors. There's no abstract entities in my model.
EDIT:
code :
 - (void)onFinishParsing {  
  // lock the store we share with main thread's context  
  [persistentStoreCoordinator lock];  

  // save any changes, observe it so we can trigger merge with the actual context  
  @try {  
    [threadManagedObjectContext processPendingChanges];  
  }  
  @catch (NSException * e) {  
    DLog(@"%@", [e description]);  
    [persistentStoreCoordinator unlock];  
  }  
  @finally {  
    // pass  
  }  

  NSNotificationCenter *dnc = [NSNotificationCenter defaultCenter];  
  [dnc addObserver:self selector:@selector(threadControllerContextDidSave:) name:NSManagedObjectContextDidSaveNotification object:threadManagedObjectContext];  
  @try {  
    NSError *error;  
    if (![threadManagedObjectContext save:&error]) {  
      DLog(@"%@", [error localizedDescription]);  
      [persistentStoreCoordinator unlock];  
      [self performSelectorOnMainThread:@selector(handleSaveError:) withObject:nil waitUntilDone:NO];  
    }  
  } @catch (NSException *e) {  
    DLog(@"%@", [e description]);  
    [persistentStoreCoordinator unlock];  
  } @finally {  
    // pass  
  }  
  [dnc removeObserver:self name:NSManagedObjectContextDidSaveNotification object:threadManagedObjectContext];  

  [self performSelectorOnMainThread:@selector(parserFinished:) withObject:nil waitUntilDone:NO];  
}  

// Merging changes causes the fetched results controller to update its results  
- (void)threadControllerContextDidSave:(NSNotification*)saveNotification {  
  // need to unlock before we let main thread merge  
  [persistentStoreCoordinator unlock];  
  [self performSelectorOnMainThread:@selector(mergeToMainContext:) withObject:saveNotification waitUntilDone:YES];  
}  

- (void)mergeToMainContext:(NSNotification*)saveNotification {  
  NSError *error;  
  [managedObjectContext mergeChangesFromContextDidSaveNotification:saveNotification];  
  if (![managedObjectContext save:&error]) {  
    DLog(@"%@", [error localizedDescription]);  
    [self handleSaveError:nil];  
  }  
}  
Problem with Core Data information not showing until iPhone app closed and re-opened

Problem with Core Data information not showing until iPhone app closed and re-opened


By : ROBERT MILLWARD
Date : March 29 2020, 07:55 AM
wish helps you What's happening is that your app is parsing RSS data and storing whatever is parsed into Core Data storage. However, your views aren't updated when Core Data is updated. It's similar to loading a web page and then having something else change the HTML for the page without having the browser reload; that's what's happening with your UITableView.
It seems like what you need is to refresh the data source for the UITableView when the parser reaches the end of the RSS feed.
iPhone Core Data problem

iPhone Core Data problem


By : user1981190
Date : March 29 2020, 07:55 AM
wish help you to fix your issue You should use %@ instead of %s in your NSLog format, this will allow the Core Data object properties to show up properly (%@ is able to display pretty much every built-in NSObject classes).
iPhone SDK Core Data relationships problem

iPhone SDK Core Data relationships problem


By : stukid
Date : March 29 2020, 07:55 AM
With these it helps I'm having a problem with relationships between to entities in Core Data. I'm parsing some JSON and adding the entities: , I am inferring your entity graph here but:
code :
[self.listing valueForKeyPath:@"hoursets.hourset"]
NSLog(@"There are %d hourSets", [hourSets count]);
Abstract class with Method with Data type defined afterwards which has pointer to the Class. Going round

Abstract class with Method with Data type defined afterwards which has pointer to the Class. Going round


By : The IT Recruit
Date : March 29 2020, 07:55 AM
this one helps. I am trying to implement an abstract class 'Primitive' defined as , Use forward declarations in your header files:
code :
class Intersection; // forward declaration

class Primitive { /* as before */ };
class Primitive; // forward declaration

class Intersection { /* as before */ };
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