Problem

restkit_coredata_problem.m

// in the app delegate
RKObjectManager *objectManager = [RKObjectManager objectManagerWithBaseURL:@"http://192.168.0.29:8080/"];
RKManagedObjectStore *objectStore = [RKManagedObjectStore objectStoreWithStoreFilename:@"TestJSON.sqlite"];
	[objectManager setObjectStore:objectStore];


// following is called within a view


if (self) {
        loginPayload = @"{ \"conti\":[ { \"id\": 1, \"numeroConto\":\"000001\", \"iban\":\"IT0000000000000000000000001\", \"intestatario\":\"ciccio pasticcio\", \"contoDefault\":true }, { \"numeroConto\":\"000002\", \"iban\":\"IT0000000000000000000000002\", \"intestatario\":\"nome e cognome\", \"contoDefault\":false }, { \"numeroConto\":\"000003\", \"iban\":\"IT0000000000000000000000003\", \"intestatario\":\"nome e cognome\", \"contoDefault\":false }, { \"numeroConto\":\"000004\", \"iban\":\"IT0000000000000000000000004\", \"intestatario\":\"nome e cognome\", \"contoDefault\":false }, { \"numeroConto\":\"000005\", \"iban\":\"IT0000000000000000000000005\", \"intestatario\":\"nome e cognome\", \"contoDefault\":false }, { \"numeroConto\":\"000006\", \"iban\":\"IT0000000000000000000000006\", \"intestatario\":\"nome e cognome\", \"contoDefault\":false }] }";
		
		dictionary = [loginPayload objectFromJSONString];
  
		mappingProvider = [RKObjectMappingProvider new];
		
		RKManagedObjectMapping *contoMapping = [RKManagedObjectMapping mappingForClass:[Conto class]];
		[contoMapping mapKeyPath:@"numeroConto" toAttribute:@"numeroConto"];
		[contoMapping mapKeyPath:@"iban" toAttribute:@"iban"];
		[contoMapping mapKeyPath:@"intestatario" toAttribute:@"intestatario"];
		[contoMapping mapKeyPath:@"contoDefault" toAttribute:@"contoDefault"];
		
		[mappingProvider setMapping:contoMapping forKeyPath:@"conti"];
		
		RKObjectMapper* mapper = [RKObjectMapper mapperWithObject:dictionary 
				                	  mappingProvider:mappingProvider];
		mapper.targetObject = self->targetObject;
		mapper.delegate = self;
		RKObjectMappingResult *result = [mapper performMapping];
		
		[[RKObjectManager sharedManager].mappingProvider setMapping:contoMapping
								forKeyPath:@"conti"];
		
		NSError *error = nil;
		
		CBAppDelegate *mainDelegate = (CBAppDelegate*)[[UIApplication sharedApplication] delegate];
		
		if ([mainDelegate.managedObjectContext hasChanges]) {
			NSLog(@"Something to save"); // never happen
		} else {
			NSLog(@"Nothing to save");
		}
		
		if (![mainDelegate.managedObjectContext save:&error]) {
			NSLog(@"Error db sqlite %@", error);			
		} else {
			NSLog(@"Ok!"); // always this, obviously, since there is nothing to save
		}
	}