Coercing NSNull value to nil in shouldSetValue:atKeyPath res

Question

我有一个从数据库中收集公司名称和电话号码的Web服务。但有时不提供电话号码。当我尝试使用 restkit 将电话号码映射到对象时，我有时会收到值为零的警告。然后我收到警告消息：

Coercing NSNull value to nil in shouldSetValue:atKeyPath: -- should be fixed.

任何建议如何将 nil 映射到 NSNull？

这是我的客户实现类（.h）的头文件：

 #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

客户关系类（.m）的实施文件

 #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

这是我进行映射的地方：

- (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

看到该错误，我想您使用的是旧版本的 RestKit，您应该更新。

也就是说，您应该能够将其与RestKit支持的KVC验证联系起来。如果在目标模型对象上实现validateValue:forKey:error:，则可以验证和编辑为任何键设置的值。

Answer 2

我终于找到了为什么从未调用验证方法。错误在行中

RKObjectMapping *customerRelationMapping = [RKObjectMapping requestMapping];

什么应该得到类：

  RKObjectMapping *customerRelationMapping = [RKObjectMapping mappingForClass:[Article class]];