無法在覈心數據存儲從因爲NSUnknownKeyException

的RestKit我有一個返回數據作爲這樣一個Web服務：無法在覈心數據存儲從因爲NSUnknownKeyException

{"facebook_friends":[{"name":"Jennifer","id":"38493"},{"name":"Sarah","id":"363"},

這裏是我的代碼：

RKManagedObjectStore* objectStore = [RKManagedObjectStore objectStoreWithStoreFilename:@"MyApp.sqlite"]; 
RKObjectManager* objectManager = [RKObjectManager objectManagerWithBaseURLString:@"http://192.168.85.128"]; 
objectManager.objectStore = objectStore; 

RKManagedObjectMapping *friendMapping = [RKManagedObjectMapping mappingForClass:[Friend class] inManagedObjectStore:objectStore]; 
[friendMapping mapKeyPath:@"id" toAttribute:@"facebook_id"]; 
[friendMapping mapKeyPath:@"name" toAttribute:@"name"]; 
friendMapping.primaryKeyAttribute = @"facebook_id"; 

[[RKObjectManager sharedManager].mappingProvider setMapping:friendMapping forKeyPath:@"facebook_friends"]; 

[objectManager loadObjectsAtResourcePath:@"/sharing/friends_facebook.json" delegate:self];

但我得到這個錯誤：

2012-06-05 09:53:14.098 promobust[10071:1520b] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<NSManagedObject 0x6d153b0> setValue:forUndefinedKey:]: the entity Friend is not key value coding-compliant for the key "facebook_id".'

我不明白什麼是錯的，因爲每個實體都有一個id屬性 - 任何人都看到我我做錯了嗎？

更新：友元類：

@interface Friend : NSManagedObject 
    @property (nonatomic, retain) NSNumber* facebook_id; 
    @property (nonatomic, retain) NSString* name; 

- (BOOL)validateName:(id *)ioValue error:(NSError **)outError; 

@end 

@implementation Friend 
    // We use @dynamic for the properties in Core Data 
    @dynamic facebook_id; 
    @dynamic name; 


- (BOOL)validateName:(id *)ioValue error:(NSError **)outError { 
    NSLog(@"Validating Friend"); 
    return YES; 
}

謝謝！

來源

2012-06-05 Eric

我已通過更新將Friend類添加到問題中。我應該如何在文本中顯示我的核心數據模型？另外，我將努力接受所有未來的好迴應，並且會及時回去做同樣的事情。再次感謝。 – Eric

如果我沒有刪除我的應用程序CoreData模型這將有助於！

它仍然沒有工作，但有一個不同的錯誤 - 我會關閉這個問題。

來源

2012-06-05 14:22:02 Eric

無法在覈心數據存儲從因爲NSUnknownKeyException

回答

相關問題