Objective c RestKit不'；t将数据保存到数据库

我是第一次使用RestKit，但在将对象保存到数据库中时遇到了一些问题，或者它们的值没有得到存储

我有一个JSON请求，如下所示：

{"categories":{"id":1 ... 

RKObjectManager *objectManager = [RKObjectManager objectManagerWithBaseURLString:@"[base-url]"]; 

RKManagedObjectStore* objectStore = [RKManagedObjectStore objectStoreWithStoreFilename:@"App.sqlite"];
objectManager.objectStore = objectStore;

objectManager.client.requestQueue.showsNetworkActivityIndicatorWhenBusy = YES;

RKManagedObjectMapping *categoryMapping = [RKManagedObjectMapping mappingForClass:[Category class] inManagedObjectStore:objectManager.objectStore];

[objectManager.mappingProvider setObjectMapping:categoryMapping forResourcePathPattern:@"[path-to-json].json"];

[[RKObjectManager sharedManager].mappingProvider setMapping:categoryMapping forKeyPath:@"categories"];

// Maps keys between the database and costom model object.
categoryMapping.primaryKeyAttribute = @"categoryId";
[categoryMapping mapKeyPath:@"categories.id" toAttribute:@"categoryId"];
[categoryMapping mapKeyPath:@"categories.name" toAttribute:@"name"];
[...]

@interface Category : NSManagedObject

@property (nonatomic, retain) NSNumber *categoryId;
@property (nonatomic, retain) NSString *name;
[...]

@implementation Category

@dynamic categoryId;
@dynamic name;
[...]

我为类别设置了如下映射：

{"categories":{"id":1 ... 

RKObjectManager *objectManager = [RKObjectManager objectManagerWithBaseURLString:@"[base-url]"]; 

RKManagedObjectStore* objectStore = [RKManagedObjectStore objectStoreWithStoreFilename:@"App.sqlite"];
objectManager.objectStore = objectStore;

objectManager.client.requestQueue.showsNetworkActivityIndicatorWhenBusy = YES;

RKManagedObjectMapping *categoryMapping = [RKManagedObjectMapping mappingForClass:[Category class] inManagedObjectStore:objectManager.objectStore];

[objectManager.mappingProvider setObjectMapping:categoryMapping forResourcePathPattern:@"[path-to-json].json"];

[[RKObjectManager sharedManager].mappingProvider setMapping:categoryMapping forKeyPath:@"categories"];

// Maps keys between the database and costom model object.
categoryMapping.primaryKeyAttribute = @"categoryId";
[categoryMapping mapKeyPath:@"categories.id" toAttribute:@"categoryId"];
[categoryMapping mapKeyPath:@"categories.name" toAttribute:@"name"];
[...]

@interface Category : NSManagedObject

@property (nonatomic, retain) NSNumber *categoryId;
@property (nonatomic, retain) NSString *name;
[...]

@implementation Category

@dynamic categoryId;
@dynamic name;
[...]

该类别的自定义模型对象如下所示：

{"categories":{"id":1 ... 

RKObjectManager *objectManager = [RKObjectManager objectManagerWithBaseURLString:@"[base-url]"]; 

RKManagedObjectStore* objectStore = [RKManagedObjectStore objectStoreWithStoreFilename:@"App.sqlite"];
objectManager.objectStore = objectStore;

objectManager.client.requestQueue.showsNetworkActivityIndicatorWhenBusy = YES;

RKManagedObjectMapping *categoryMapping = [RKManagedObjectMapping mappingForClass:[Category class] inManagedObjectStore:objectManager.objectStore];

[objectManager.mappingProvider setObjectMapping:categoryMapping forResourcePathPattern:@"[path-to-json].json"];

[[RKObjectManager sharedManager].mappingProvider setMapping:categoryMapping forKeyPath:@"categories"];

// Maps keys between the database and costom model object.
categoryMapping.primaryKeyAttribute = @"categoryId";
[categoryMapping mapKeyPath:@"categories.id" toAttribute:@"categoryId"];
[categoryMapping mapKeyPath:@"categories.name" toAttribute:@"name"];
[...]

@interface Category : NSManagedObject

@property (nonatomic, retain) NSNumber *categoryId;
@property (nonatomic, retain) NSString *name;
[...]

@implementation Category

@dynamic categoryId;
@dynamic name;
[...]

我像这样加载对象（与Twitter示例一样）：

正如我所说的，当我从模拟器检查本地数据库时，它会被插入，但值为NULL，category_id始终为0

有没有办法解决这个问题？非常感谢

尝试此映射：

RKManagedObjectMapping* categoryMapping = [RKManagedObjectMapping mappingForClass: [Category class]];
categoryMapping.primaryKeyAttribute = @"categoryId";
categoryMapping.rootKeyPath = @"categories";
[categoryMapping mapKeyPathsToAttributes: @"id", @"categoryId", @"name", @"name", nil];

及

它说，在检测“类别”时使用此映射，并通过“categoryId”索引核心数据对象

或

及

---

谢谢，第一次映射成功了，我不需要更改

[[RKObjectManager sharedManager].mappingProvider setMapping:CategoryMappingForkeyPath:@”“但我更改了以下内容：`objectManager.objectStore=[RkmanagedObjectStoreWithStoreFileName:databaseName usingSeedDatabaseName:nil managedObjectModel:nil delegate:self]；`。谢谢