RestKit - 非密鑰值編碼兼容

我有一個管理對象MyEntity，我在整個應用程序中使用時沒有任何問題。RestKit - 非密鑰值編碼兼容

@interface MyEntity : NSManagedObject 

@property (nonatomic, retain) NSString *code; 
@property (nonatomic, retain) NSNumber *def_value; 
@property (nonatomic, retain) NSString *label; 
@property (nonatomic, retain) NSString *link_label; 
@property (nonatomic, retain) NSNumber *order; 

@end

我有一個Web服務http://my_server/MyEntity返回我：

[ 
    { 
     CODE: "TYPE", 
     LABEL: "Administrative", 
     ORDER: "3", 
     DEF_VALUE: "0", 
     LINK_LABEL: "" 
    }, 
    { 
     CODE: "TOPIC", 
     LABEL: "NDF", 
     ORDER: "1", 
     DEF_VALUE: "0", 
     LINK_LABEL: "Administrative" 
    }, 
    { 
     CODE: "TOPIC", 
     LABEL: "Report", 
     ORDER: "2", 
     DEF_VALUE: "1", 
     LINK_LABEL: "Administrative" 
    }, 
    { 
     CODE: "TOPIC", 
     LABEL: "Other", 
     ORDER: "3", 
     DEF_VALUE: "0", 
     LINK_LABEL: "Administrative" 
    }, ... 
]

我試圖映射並獲取該列表

NSURL *baseUrl = [NSURL URLWithString: @"http://my_server"]; 
NSString *objName = @"MyEntity"; 
NSManagedObjectModel *managedObjectModel = [NSManagedObjectModel mergedModelFromBundles:nil]; 
RKManagedObjectStore *managedObjectStore = [[RKManagedObjectStore alloc] initWithManagedObjectModel:managedObjectModel]; 
[RKManagedObjectStore setDefaultStore:managedObjectStore]; 
[managedObjectStore createPersistentStoreCoordinator]; 

RKObjectManager *objectManager = [RKObjectManager managerWithBaseURL: baseUrl]; 
RKEntityMapping *objMap = [RKEntityMapping mappingForEntityForName:objName inManagedObjectStore:managedObjectStore]; 
[objMap addAttributeMappingsFromDictionary: @{ 
    @"CODE": @"code", 
    @"LABEL": @"label", 
    @"ORDER": @"order", 
    @"DEF_VALUE": @"def_value", 
    @"LINK_LABEL": @"link_label", 
}]; 

RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:objMap pathPattern:nil keyPath:nil statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)]; 

[objectManager addResponseDescriptor:responseDescriptor]; 
[objectManager getObjectsAtPath:objName parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) { 
    NSLog(@"ok"); 
} failure:^(RKObjectRequestOperation *operation, NSError *error) { 
    NSLog(@"ko"); 
}];

它給我這個錯誤

I restkit.network:RKHTTPRequestOperation.m:185 GET 'http://my_server/MyEntity' (200 OK) CoreData: error: Failed to call designated initializer on NSManagedObject class 'MyEntity'
Terminating app due to uncaught exception 'NSUnknownKeyException', reason:
'[ valueForUndefinedKey:]: the entity (null) is not key value coding-compliant for the key "link_label".'

我看到這個錯誤或者2或3個SO問題，但每個問題都有不同的問題，而且看起來不是我的問題。

有人可以幫我調試嗎？

來源

2013-05-21 Pierre de LESPINAY

早期的錯誤，'未能呼籲NSManagedObject類指定初始化'MyEntity'是一個更直接的問題，可能是鍵值編碼例外的原因。 –

你需要充分配置objectManager：

objectManager.managedObjectStore = managedObjectStore;

您還沒有完成核心數據堆棧初始化：

[managedObjectStore createManagedObjectContexts];

來源

2013-05-21 17:16:31 Wain

這個'不能創建託管對象上下文：持久性存儲協調器沒有任何持久性存儲' –

在createPersistentStoreCoordinator之後調用，是嗎？ – Wain

我調用'createPersistentStoreCoordinator'，然後調用'createManagedObjectContexts' –

RestKit - 非密鑰值編碼兼容

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