ResKit對象映射嵌套對象

Question

我正在嘗試使用RestKit來解析某些JSON。該應用程序用於跟蹤比賽，並具有場地，遊戲和玩家的概念。一場比賽有贏家和輸家（都是班級玩家）和一個場地。由Web服務返回的JSON看起來是這樣的：

[{"id":1,"winner":{"name":"NAME2","id":2,"picture_url":"CK.png"},"loser":{"name":"NAME3","id":3,"picture_url":"NJ.png"},"venue":{"name":"Venue 1","id":2}}, 
{"id":2,"winner":{"name":"NAME2","id":2,"picture_url":"CK.png"},"loser":{"name":"NAME1","id":1,"picture_url":"NC.png"},"venue":{"name":"Venue 1","id":2}}, 
{"id":3,"winner":{"name":"NAME2","id":2,"picture_url":"CK.png"},"loser":{"name":"NAME3","id":3,"picture_url":"NJ.png"},"venue":{"name":"Venue 1","id":2}}, 
{"id":4,"winner":{"name":"NAME2","id":2,"picture_url":"CK.png"},"loser":{"name":"NAME1","id":1,"picture_url":"NC.png"},"venue":{"name":"Venue 1","id":2}}] 

我對象的頭文件是這樣的：

# PTGame.h 
@interface PTGame : NSObject 
@property (nonatomic, assign) NSNumber *uid; 
@property (nonatomic, assign) PTPlayer *winner; 
@property (nonatomic, assign) PTPlayer *loser; 
@property (nonatomic, assign) PTVenue *venue; 
@end 

# PTVenue.h 
@interface PTVenue : NSObject 
@property (nonatomic, copy) NSString *name; 
@property (nonatomic, assign) NSNumber *uid; 
-(CLLocation *)location; 
-(CLLocationDistance)distanceFromLocation:(CLLocation *)location; 
@end 

# PTPlayer.h 
@interface PTPlayer : NSObject 
@property (nonatomic, copy) NSString *name; 
@property (nonatomic, copy) NSString *pictureUrl; 
@property (nonatomic, assign) NSNumber *uid; 
@end 

最後，我映射設置的樣子：

RKObjectManager *objectManager = [[RKObjectManager alloc] initWithHTTPClient:client]; 

RKObjectMapping *venueMapping = [RKObjectMapping mappingForClass:[PTVenue class]]; 
[venueMapping addAttributeMappingsFromDictionary:@{@"name"  : @"name", 
                @"id"  : @"uid"}]; 

RKObjectMapping *playerMapping = [RKObjectMapping mappingForClass:[PTPlayer class]]; 
[playerMapping addAttributeMappingsFromDictionary:@{@"name"  : @"name", 
                @"id"   : @"uid", 
                @"picture_url": @"pictureUrl"}]; 

// Add Object Mapping for PTGame 
RKObjectMapping *gameResponseMapping = [RKObjectMapping mappingForClass:[PTGame class]]; 

// Setup Game Object relationships 
[gameResponseMapping addAttributeMappingsFromDictionary:@{@"id": @"uid"}]; 
[gameResponseMapping addRelationshipMappingWithSourceKeyPath:@"winner" mapping:playerMapping]; 
[gameResponseMapping addRelationshipMappingWithSourceKeyPath:@"loser" mapping:playerMapping]; 
[gameResponseMapping addRelationshipMappingWithSourceKeyPath:@"venue" mapping:venueMapping]; 

NSIndexSet *statusCodes = RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful); 

RKResponseDescriptor *gameListResponseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:gameResponseMapping 
                           method:RKRequestMethodGET 
                          pathPattern:@"/games.json" 
                           keyPath:nil 
                          statusCodes:statusCodes]; 
[objectManager addResponseDescriptor:gameListResponseDescriptor]; 

這一切看起來很適合我。返回結果時不會引發錯誤，但稍後在嘗試訪問遊戲屬性時會出現異常。通過XCode調試器查看對象顯示：

某些東西似乎被打破 - 爲什麼這些字符串顯示爲「贏家」和「場地」。爲什麼uid爲空？每當我提出請求時，對象似乎都不一樣，導致我相信內存處理不當。

任何想法？

Answer 1

Wain的評論讓我看不到映射代碼的路徑。我查看了RestKit Object Mapping docs，發現所有屬性都使用nonatomic和copy屬性，而不是assign。此外，該對象的引用（如PTPlayer *winner是簡單地nonatomic更改我的代碼，以反映這個固定的問題

產生的頭文件是這樣的：。

# PTPlayer.h 
@interface PTPlayer : NSObject 
@property (nonatomic, copy) NSString *name; 
@property (nonatomic, copy) NSString *pictureUrl; 
@property (nonatomic, copy) NSNumber *uid; 
@end 

# PTVenue.h 
@interface PTVenue : NSObject 
@property (nonatomic, copy) NSString *name; 
@property (nonatomic, copy) NSNumber *uid; 
@property (nonatomic, assign) CGFloat longitude; 
@property (nonatomic, assign) CGFloat latitude; 
-(CLLocation *)location; 
-(CLLocationDistance)distanceFromLocation:(CLLocation *)location; 
@end 


# PTGame.h 
@interface PTGame : NSObject 
@property (nonatomic, copy) NSNumber *uid; 
@property (nonatomic) PTPlayer *winner; 
@property (nonatomic) PTPlayer *loser; 
@property (nonatomic) PTVenue *venue; 
@end