Restkit屬性映射失敗的轉型錯誤

這是我的示例代碼是什麼樣子：Restkit屬性映射失敗的轉型錯誤

{ 
    "name": "Ahmad Mansour", 
    "subjects": [ 
     { 
      "parent_subject_name": "Arabic", 
      "subject_name": "Shafahi", 
      "exams": [ 
       { 
        "score": "30.00", 
        "exam_name": "Sa3i 1 " 
       }, 
       { 
        "score": "50.00", 
        "exam_name": "sa3i 2" 
       }, 
       { 
        "score": "100.00", 
        "exam_name": "First Semester Exam" 
       } 
      ] 
     }, 
     { 
      "parent_subject_name": "Arabic", 
      "subject_name": "Khati", 
      "exams": [ 
       { 
        "score": "50.00", 
        "exam_name": "Sa3i 1 " 
       }, 
       { 
        "score": "60.00", 
        "exam_name": "sa3i 2" 
       }, 
       { 
        "score": "95.00", 
        "exam_name": "First Semester Exam" 
       } 
      ] 
     },

爲subject實體..我的測繪工作的很好：

RKEntityMapping *subjectEntityMapping = [RKEntityMapping mappingForEntityForName:kSubjectIdentity inManagedObjectStore:model.managedObjectStore]; 
[subjectEntityMapping addAttributeMappingsFromDictionary:@{ @"subject_name": @"name", 
                  @"parent_subject_name" :@"parent_name" 
                  }]; 

subjectEntityMapping.identificationAttributes = @[ @"name" ]; 

RKResponseDescriptor *studentResponseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:subjectEntityMapping pathPattern:kGradesPath keyPath:@"subjects" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)]; 

[model.objectManager addResponseDescriptor:studentResponseDescriptor];

但是當我做考試分數映射..東西炸燬：

RKEntityMapping *examEntityMapping = [RKEntityMapping mappingForEntityForName:kExamIdentity inManagedObjectStore:model.managedObjectStore]; 
[examEntityMapping addAttributeMappingsFromDictionary:@{ @"exams.exam_name": @"name" }]; 

examEntityMapping.identificationAttributes = @[ @"name" ]; 

RKResponseDescriptor *examResponseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:examEntityMapping pathPattern:kGradesPath keyPath:@"subjects" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)]; 

[model.objectManager addResponseDescriptor:examResponseDescriptor];

我得到以下錯誤：

E restkit.object_mapping:RKMappingOperation.m:431 Failed transformation of value at keyPath 'exams.exam_name' to representation of type 'NSString': Error Domain=org.restkit.RKValueTransformers.ErrorDomain Code=3002 "Failed transformation of value '(
    "Sa3i 1 ", 
    "sa3i 2", 
    "First Semester Exam" 
)' to NSString: none of the 2 value transformers consulted were successful." UserInfo=0x9a508a0 {detailedErrors=(
    "Error Domain=org.restkit.RKValueTransformers.ErrorDomain Code=3002 \"The given value is not already an instance of 'NSString'\" UserInfo=0x9a50800 {NSLocalizedDescription=The given value is not already an instance of 'NSString'}", 
    "Error Domain=org.restkit.RKValueTransformers.ErrorDomain Code=3000 \"Expected an `inputValue` of type `NSNull`, but got a `__NSArrayI`.\" UserInfo=0x9a50830 {NSLocalizedDescription=Expected an `inputValue` of type `NSNull`, but got a `__NSArrayI`.}"

我也試過這種映射，但是我得到確切同樣的錯誤：

[examEntityMapping addAttributeMappingsFromDictionary:@{ @"exam_name": @"name" }]; 

examEntityMapping.identificationAttributes = @[ @"name" ]; 

RKResponseDescriptor *examResponseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:examEntityMapping pathPattern:kGradesPath keyPath:@"subjects.exams" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

想法？

來源

2013-10-26 abbood

您不應該有考試的回覆描述符。它嵌套在主題中的數據，所以它應該使用主題映射關係進行映射。

使用響應描述符不起作用，因爲當映射僅適用於一個映射時，您試圖映射到2個數組。因此，當RestKit嘗試將數組轉換爲字符串時會出現錯誤。

此外，對於考試的映射，你應該可能是因爲考試的名字被反覆用於不同的情況下，唯一的身份指定多個屬性...

來源

2013-10-26 14:24:12 Wain

我不知道做什麼用你給的信息上面..一方面你說這應該是一個主題映射..在另一個你說的主題或不，我映射2個數組在一個.. 你可以請給我看一些代碼應該解決問題？無論是主題映射還是考試映射？ – abbood

你需要主題和考試映射。但你只需要1個響應描述符 - 主題。那麼你應該有2個映射（和實體）之間的關係。 https://github.com/RestKit/RestKit/wiki/Object-mapping#relationships – Wain

Restkit屬性映射失敗的轉型錯誤

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