我有以下型号:
@interface EquipmentModel : NSManagedObject
@property (nonatomic, retain) NSDate * creationDate;
@property (nonatomic, retain) NSString * desc;
@property (nonatomic, retain) NSNumber * identifier;
@property (nonatomic, retain) NSDate * lastModifiedDate;
@property (nonatomic, retain) NSString * name;
@property (nonatomic, retain) NSNumber * manufacturerID;
@property (nonatomic, retain) Manufacturer *manufacturer;
我使用RESTKit和以下映射获取该对象:
RKEntityMapping *equipmentModelMapping = [RKEntityMapping mappingForEntityForName:@"EquipmentModel" inManagedObjectStore:managedObjectStore];
equipmentModelMapping.identificationAttributes = @[@"identifier"];
[equipmentModelMapping addAttributeMappingsFromDictionary:@{
@"id": @"identifier",
@"description": @"desc",
@"manufacturer_id": @"manufacturerID",
@"creation_date": @"creationDate",
@"last_modified_date": @"lastModifiedDate",
}];
[equipmentModelMapping addAttributeMappingsFromArray:@[ @"name"]];
[equipmentModelMapping addConnectionForRelationship:@"manufacturer" connectedBy:@{ @"manufacturerID": @"identifier"}];
然而,有时制造商不会在模型之前获取,因此一旦 getObjectsAtPath >,模型的关系“制造商”关系将等于nil strong>通话已完成。由于我将manufacturerID设为非瞬态,我仍然会将它存储起来。我怎样才能更新关系呢?
一种可能性是在获取制造商后获取模型。但是,我有其他更复杂的对象,这种方法不起作用,效率不高。如何根据该ID链接CoreData中的关系?!
非常感谢!
答案 0 :(得分:0)
您建议的解决方案是正确的,您只想选择如何预测您的提取,以便仅返回未连接的模型。如果要处理大量项目,您还可以批量提取,更新和保存。在这种情况下,没有办法让Core Data或RestKit为您建立关系。