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的,我有以下型號:如何刷新(無瞬態)與對象基於_id關係獲取不同步
@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獲取該對象和下面的映射:
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,有時候製造商有可能沒有在之前取這個模型,因此關係「製造商」關係將等於零,對於該模型,一旦getObjectsAtPath通話完成。由於我製造商ID非瞬態,我仍然會存儲它。我如何更新關係呢?
一種可能性是一旦製造商取回,就取回模型。但是,我有其他更復雜的對象,這種方法不會工作,並且效率不高。如何根據該ID鏈接CoreData中的關係?
非常感謝!