desired type NSNumber given type __NSCFString error

Question

I'm getting a core data error that I can't figure out how to fix.

I am basically pulling out all the data of an object into a dictionary, showing the data to a form, and some fields allow editing, then trying to store the data back to the object on submission.

However, on setting all the new/updated values I get the error

Unacceptable type of value for attribute: property = "totalLocations"; desired type = NSNumber; given type = __NSCFString; value = 7.

Here is the code that handles this particular property...

    //grab the value from the property

    if (myObject.totalLocations)
    [data setObject:myObject.totalLocations forKey:@"totalLocations"];

    // store it back to the object
    _myObject.totalLocations = [data objectForKey:@"totalLocations"];

aside from these two lines there isn't too much usage of the property. it can be modified, but not by the user on this particular screen

Answer 1

Is the type of totalLocations in your core data entity Integer and is myObject.totalLocations a NSString? If yes you should set the core data like this:

[data setValue:[NSNumber numberWithInteger:[myObject.totalLocations integerValue]] forKey:@"totalLocations"];

The way I set my managed objects is like this:

- (void)insertNewPromo:(NSDictionary *)promoJson
{
  NSManagedObjectContext *context = [self.promoFetchedResultsController managedObjectContext];
  NSEntityDescription *entity = [[self.promoFetchedResultsController fetchRequest] entity];
  NSManagedObject *newManagedObject = [NSEntityDescription insertNewObjectForEntityForName:[entity name] inManagedObjectContext:context];

  // Checking if inappropriate data are in the JSON to avoid some crashes.
  if ([[promoJson objectForKey:@"id"] isKindOfClass:[NSNull class]])
      [newManagedObject setValue:nil forKey:@"id"];
  else
      [newManagedObject setValue:[NSNumber numberWithInteger:[[promoJson objectForKey:@"id"] integerValue]] forKey:@"id"];
  ...
  ...
  NSError *error = nil;
  if (![context save:&error])
  {
      if (DEBUG_ON == 1)
        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
      abort();
  }
}

the id object of promoJson is a NSString