Question

我有一个带有动态键的JSON对象，比如

carBrands：

{ 13950：{ brand_id：＆＃34; 13950＆＃34;，名称：＆＃34;丰田＆＃34;，国家：＆＃34;日本＆＃34;，零售商：＆＃34;＆＃34; }， 13633：{ brand_id：＆＃34; 13633＆＃34;，名称：＆＃34; NISSAN＆＃34;，国家：＆＃34; JAPAN＆＃34;，零售商：＆＃34;＆＃34; } }

需要使用普通的JSON对象进行映射。

汽车：

{ {id：＆＃34; xyz＆＃34; brand_id：＆＃34; 13950＆＃34;，状态：＆＃34;待定＆＃34;， user_id：＆＃34; user1＆＃34; }， {id：＆＃34; ABC＆＃34;， brand_id：“13633”，状态：＆＃34;已交付＆＃34;， user_id：＆＃34; user2＆＃34; } }

以下是carBrands对象的代码。

RKEntityMapping *carBrandsMapping = [RKEntityMapping mappingForEntityForName:@"CarBrands" inManagedObjectStore:managedObjectStore];    
carBrandsMapping.forceCollectionMapping = YES;    
[ carBrandsMapping addAttributeMappingFromKeyOfRepresentationToAttribute:@"brand_id"];    
carBrandsMapping.identificationAttributes = @[@"brand_id"];    
[ carBrandsMapping addAttributeMappingsFromDictionary:@{@"(brand_id).name": @"name",    
@"(brand_id).retailer": @"retailer",    
@"(brand_id).country":@"country"    
}];

RKResponseDescriptor *brandsRD = [RKResponseDescriptor responseDescriptorWithMapping:carBrandsMapping method:RKRequestMethodGET pathPattern:nil keyPath:@”brands” statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

对于汽车对象，

RKEntityMapping *carsMapping = [RKEntityMapping mappingForEntityForName:@"Cars" inManagedObjectStore:managedObjectStore];    
carsMapping.identificationAttributes = @[@"car_id"];   
[carsMapping addAttributeMappingsFromDictionary:@{@"id": @"car_id",    
@"brand_id": @"brand_id",    
@"status": @"status",    
@"user_id": @"user_id"    
}];

RKResponseDescriptor *carsRD = [RKResponseDescriptor responseDescriptorWithMapping:carsMapping method:RKRequestMethodGET pathPattern:nil keyPath:@”cars” statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

我尝试了以下语句来定义关系。

[carsMapping addConnectionForRelationship:@"carBrands" connectedBy:@"brand_id"];

[carsMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"carBrands" toKeyPath:@"carsBrands" withMapping:brandsMapping]];

我的问题是当我拿到“汽车”时。数据使用以下陈述，我的关系对象＆＃39; carBrands＆＃39;没有。我也找到了不可映射的内容＆＃39;错误。如何解决？

[[RKObjectManager sharedManager] getObjectsAtPath:PATH_FOR_CAR parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {    
self.carsArray = mappingResult.array;
NSLog(@"%@",mappingResult.array);
} failure:^(RKObjectRequestOperation *operation, NSError *error) {
RKLogError(@"Load failed with error: %@", error);
}];

问题：

如何定义关系映射，以便获取＆＃39; Cars＆＃39;实体将拥有版权数据＆carrandy＆＃39;存储为故障而不是零？

@class CarBrands;    
@interface Cars: NSManagedObject    
@property (nonatomic, retain) NSString * car_id;    
@property (nonatomic, retain) NSString * brand_id;    
@property (nonatomic, retain) NSString * status;    
@property (nonatomic, retain) NSString * user_id;    
@property (nonatomic, retain) CarBrands *carBrands;    
@end

谢谢。

Restkit：如何使用动态密钥定义JSON对象的关系？

0 个答案: