Restkit - 实体（空）不符合键“行”的键值编码

Posted 2023-03-05

【中文标题】Restkit - 实体（空）不符合键“行”的键值编码

【英文标题】：Restkit - the entity (null) is not key value coding-compliant for the key "rows"

【发布时间】：2013-04-10 19:08:20

【问题描述】：

我使用的是 RESTKIT 0.20，但映射有问题。谁能告诉我错误在哪里？谢谢，这是我的代码：

RKObjectMapping* pageMapping = [RKEntityMapping mappingForEntityForName:@"Page" inManagedObjectStore:[RKManagedObjectStore defaultStore]];
[pageMapping addAttributeMappingsFromArray:@[ @"rows", @"columns" ]];


RKObjectMapping* magazineMapping = [RKEntityMapping mappingForEntityForName:@"Magazine" inManagedObjectStore:[RKManagedObjectStore defaultStore]];

[magazineMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"pages"
                                                                               toKeyPath:@"pages"
                                                                             withMapping:pageMapping]];


RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:magazineMapping pathPattern:nil keyPath:@"magazine" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

NSURL *URL = [NSURL URLWithString:[NSString stringWithFormat:@"%@/%@", kBasePath, [magazine contentPath]]];
NSURLRequest *r = [NSURLRequest requestWithURL:URL];
RKObjectRequestOperation *objectRequestOperation = [[RKObjectRequestOperation alloc] initWithRequest:r responseDescriptors:@[ responseDescriptor ]];

[objectRequestOperation setCompletionBlockWithSuccess:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) 
    RKLogInfo(@"Load collection of Articles: %@", mappingResult.array);
 failure:^(RKObjectRequestOperation *operation, NSError *error) 
    RKLogError(@"Operation failed with error: %@", error);
];

[objectRequestOperation start];

还有实体杂志：

@interface Magazine : NSManagedObject

@property (strong) NSString * contentPath;
@property (strong) NSDate * date;
@property (strong) NSString * icon;
@property (strong) NSString * magazineID;
@property (strong) NSDecimalNumber * price;
@property (strong) id priceLocale;
@property (strong) NSString * title;
@property (strong) Page *pages;

最后是 Page 实体：

@class Magazine;

@interface Page : NSManagedObject

@property (strong) NSString * content;
@property (strong) NSNumber * contentID;
@property (strong) NSNumber * columns;
@property (strong) NSNumber * rows;
@property (strong) NSString *pageID;
@property (strong) Magazine *assignedMagazine;

错误一定是在映射页面实体，因为其他“下载”方法没有问题。

【参考方案1】：

像这样使用映射：

RKManagedObjectMapping *mappingPage = [RKManagedObjectMapping mappingForClass:[Page class] inManagedObjectStore:self.objectStore];
    mappingPage.setDefaultValueForMissingAttributes = NO;
    mappingPage.primaryKeyAttribute = @"contentID";
    [mappingPage mapKeyPathsToAttributes:

     @"CONTENT_FROM_WEBSERVICE", @"content",
     @"ID_FROM_WEBSERVICE", @"contentID",
     @"COLUMNS_FROM_WEBSERVICE", @"columns",
     @"ROWS_FROM_WEBSERVICE", @"rows",     
     nil];

【讨论】：

现在似乎是RKEntityMapping，RK 0.20