Coercing NSNull value to nil in shouldSetValue:atKeyPath restkit - ios

Question

i'm having a web service that that collects the company names and phone numbers from the database. But sometimes a phone number is not provided. When i try to map the phone number to the object with restkit 'im getting a warning that value is nil sometimes. then i get the warning message:
Coercing NSNull value to nil in shouldSetValue:atKeyPath: -- should be fixed.
any suggestions how to map nil to NSNull?
this is my header file of my customerrealtion class (.h):
#import <Foundation/Foundation.h>
#import <RestKit/RestKit.h>
#interface CustomerRelation : NSObject
#pragma private fields
#property (nonatomic, copy) NSString *companyName;
#property (nonatomic, copy) NSString *phoneNumber;
#end
implementation file of customer relation class (.m)
#import "CustomerRelation.h"
#implementation CustomerRelation
-(BOOL)ValidatecompanyName:(id*)ioValue error:(NSError **)outError {
NSLog(#"error");
}
-(BOOL)validatephoneNumber:(id *)ioValue error:(NSError **)outError {
if (*ioValue == nil) {
if (outError != NULL) {
}
return NO;
}
return YES;
}
#end
this is where i do the mapping:
- (void)viewDidAppear:(BOOL)animated{
RKObjectManager * client = [RKObjectManager managerWithBaseURL:[NSURL URLWithString:#"http://127.0.0.1"]];
RKObjectMapping *articleMapping = [RKObjectMapping requestMapping];
[articleMapping addAttributeMappingsFromDictionary:#{#"Companyname": #"companyName",
#"Phonenumber": #"phoneNumber"}];
RKResponseDescriptor *rkresponsedesc = [RKResponseDescriptor responseDescriptorWithMapping:articleMapping method:RKRequestMethodGET pathPattern:nil keyPath:#"customers" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[client addResponseDescriptor:rkresponsedesc];
NSMutableURLRequest *request = [client requestWithObject:nil method:RKRequestMethodGET path:#"test.php" parameters:nil];
RKObjectRequestOperation *operation = [client objectRequestOperationWithRequest:request
success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
[self mappingSuccess:mappingResult];
} failure: ^(RKObjectRequestOperation *operation, NSError *error) {
NSLog(#"Failed with error: %#", [error localizedDescription]);
}];
[client enqueueObjectRequestOperation:operation];
MainViewController *viewController = [self.storyboard instantiateViewControllerWithIdentifier:#"mainViewController"];
[self.navigationController pushViewController:viewController animated:YES];
}
- (void)mappingSuccess:(RKMappingResult*)mappingResult
{
NSLog(#"Success block: %#", mappingResult);
}

Answer 1

Seeing that error I guess you're using an old version of RestKit and that you should update.
That said you should be able to tie into this with KVC validation which RestKit supports. If you implement validateValue:forKey:error: on your destination model object you can verify and edit the value being set for any key.

Answer 2

i finally found why the validate methods were never called.
the error was in the line
RKObjectMapping *customerRelationMapping = [RKObjectMapping requestMapping];
what should get the class instead:
RKObjectMapping *customerRelationMapping = [RKObjectMapping mappingForClass:[Article class]];