RestKit 实体映射

Posted 2023-03-05

【中文标题】RestKit 实体映射

【英文标题】：RestKit Entity mapping

【发布时间】：2012-12-08 07:50:24

【问题描述】：

您好，有人可以教我如何进行嵌套的 Restkit 实体映射吗？我在调试时不断收到错误消息，下面是我的错误消息和代码

[__NSSetM insertObject:atIndex:]: 无法识别的选择器发送到实例 0x95269d0

Json 数据

Family =(
      
        id = "1";
        parentName = "Mr John";
        Child =(
                
                parentID = "1";
                childName = "James";
                age = "18";

            ,
            
                parentID = "1";
                childName = "ruby";
                age = "19";
                                ,
                            
                parentID = "1";
                childName = "ella";
                age = "20";
            
        );
    
);

我的 AppDelegate.m

 RKEntityMapping *familyMapping = [RKEntityMapping mappingForEntityForName:@"Family" inManagedObjectStore:managedObjectStore];
debtorMapping.identificationAttributes = @[ @"id" ];

[familyMapping addAttributeMappingsFromDictionary:@
 @"id": @"accNo",
 @"parentName": @"companyName"
 ];


RKEntityMapping *childMapping = [RKEntityMapping mappingForEntityForName:@"Child" inManagedObjectStore:managedObjectStore];

childMapping.identificationAttributes = @[ @"parentID"];

[childMapping addAttributeMappingsFromDictionary:@
 @"parentID": @"parentID",
 @"childName": @"childName",
 @"age": @"age"
 ];


 [familyMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"Child" toKeyPath:@"Child" withMapping:childMapping]];


RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:familyMapping
                                                                                   pathPattern:nil
                                                                                       keyPath:@"Family"
                                                                                   statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];


[objectManager addResponseDescriptor:responseDescriptor];

家庭 NSManagedObject

@class Child;
@interface Family : NSManagedObject
@property (nonatomic, retain) NSString * id;
@property (nonatomic, retain) NSString * parentName;
@property (nonatomic, retain) NSSet *child;
@end
@interface Family (CoreDataGeneratedAccessors)
- (void)addChildObject:(Child *)value;
- (void)removeChildObject:(Child *)value;
- (void)addChild:(NSSet *)values;
- (void)removeChild:(NSSet *)values;
@end

子 NSManageObject

@class Family;
@interface Child : NSManagedObject
@property (nonatomic, retain) NSString * parentID;
@property (nonatomic, retain) NSString * childName;
@property (nonatomic, retain) NSString * age;
@property (nonatomic, retain) Family *family;
@end

【参考方案1】：

我已经发现了我的错误。 [familyMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"Child" toKeyPath:@"child" withMapping:childMapping]]; toKeyPath 字符串应该用小写字母分配。 “关注核心数据关系字符串”。