ios - RestKit 保留 CoreData 对象

Question

我在一个应用程序中使用 RestKit，我配置了映射器并且工作正常。我决定使用 CoreData 进行缓存，并使用通常的 fecthController 在表格 View 中显示核心数据模型。我的应用程序的第一个屏幕是一个具有三个选项卡的 UITabViewController。在每个选项卡中，我都有来自不同实体的不同信息，我可以在选项卡之间切换并且一切正常。问题是当我在一个选项卡中进行搜索时，我丢失了其他选项卡中的数据。我深入研究了这个问题，并且看到了以下内容:当我搜索某些内容时，正在删除我的其他实体!!我尝试创建不同的上下文和一些与核心数据相关的东西，但没有任何效果。

// Configuration stuff
    let objectManager: RKObjectManager = RKObjectManager(baseURL: baseURL);
    let managedObjectModel: NSManagedObjectModel = NSManagedObjectModel(contentsOfURL: modelURL!)!;
    let managedObjectStore: RKManagedObjectStore = RKManagedObjectStore(managedObjectModel: managedObjectModel);
    objectManager.managedObjectStore = managedObjectStore;     
    managedObjectStore.createPersistentStoreCoordinator();
    do {
        try managedObjectStore.addSQLitePersistentStoreAtPath(storePath, fromSeedDatabaseAtPath: seedPath, withConfiguration: nil, options: nil);
    } catch let err as NSError {
        fatalError()
    }

    // Create the managed object contexts
    managedObjectStore.createManagedObjectContexts();
    managedObjectStore.managedObjectCache =  RKInMemoryManagedObjectCache(managedObjectContext:      managedObjectStore.persistentStoreManagedObjectContext)

// Mapping
    let entityMapping: RKEntityMapping = RKEntityMapping(
      forEntityForName: "Entity",
      inManagedObjectStore: RKObjectManager.sharedManager().managedObjectStore
    );
    entityMapping.identificationAttributes = ["id"];

    entityMapping.addAttributeMappingsFromArray([
      "id", "firstName", "lastName", "birthdate"
    ]);

    //Get Data from server
    class Datalist{
        class fun fetchData(successClosure:[Entity]->Void,failure:String->Void){
           RKObjectManager.sharedManager().getObjectsAtPath(
                    path,
                    parameters: nil,
                    success: {
                        ( operation: RKObjectRequestOperation!, result: RKMappingResult!) -> Void in
                        dispatch_async(dispatch_get_main_queue(), {
                            () -> Void in
                            successClosure(result.array());
                        });
                    },
                    failure: {
                        ( operation: RKObjectRequestOperation!, error: NSError!) -> Void in
                        dispatch_async(dispatch_get_main_queue(), {
                            () -> Void in
                            failureClosure();
                        });
                    }
                );
            }
     }
}
//Show data
class ListViewController:NSFetchedResultsControllerDelegate{

       private var fetchedResultsController: NSFetchedResultsController!;

       override func viewDidLoad() {
          super.viewDidLoad();
          fetchedResultsController = NSFetchedResultsController(
          fetchRequest: fetchRequest, managedObjectContext: RKManagedObjectStore.defaultStore().mainQueueManagedObjectContext,
            sectionNameKeyPath: "formatted",
            cacheName: nil)

          fetchedResultsController?.delegate = self
          getData()
       }

       private func getData(){
           DataList.fetchData({data in
              let ids = getEntitiesId(data)
              fetchedResultsController.fetchRequest.predicate = createPredicateFromIds(ids)
              try! self.fetchedResultsController?.performFetch() 
           },failure:{message in 
               showMessage(message)
           })
       }

       func createPredicateFromIds( entityIds: [Int] ) -> NSPredicate {
        let predicate: NSPredicate = NSPredicate( format: "id IN $ENTITYIDS" ).predicateWithSubstitutionVariables(["ENTITYIDS" : entityIds]);
        return predicate;
    }
}

Answer 1

我终于看到了问题所在，它与删除孤立对象有关。因为在三个选项卡中是不同的实体，当我在实体中执行搜索时，会使其他实体成为孤立实体并删除数据!只覆盖这个属性:

override var deletesOrphanedObjects: Bool  {
        get{
            return false;
        }
        set{

        }
    };