将更多对象提取到实体中后核心数据关系丢失

我有一个如下所示的核心数据模型。

在表格视图中，我加载了所有约会。上一个UILabel在我里面custom cell我将约会地点名称设置如下。

NSString *info = appointment.location.label_vrij;

起初一切正常，但是当我将更多约会加载到我的database。 所有信息字符串都消失了NULL。经过一些调试我也注意到appointment.location回报NULL.

这就是我的 NSFetchRequest 的样子

RKManagedObjectStore *store = [[SanMaxDataModel sharedDataModel] objectStore];
    NSManagedObjectContext *context = store.mainQueueManagedObjectContext;

    NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"Appointment"];
    NSString *relationshipKeyPath = @"location"; // Set this to the name of the relationship on "A" that points to the "B" objects;
    NSArray *keyPaths = [NSArray arrayWithObject:relationshipKeyPath];
    [fetchRequest setRelationshipKeyPathsForPrefetching:keyPaths];
    NSSortDescriptor *descriptor = [NSSortDescriptor sortDescriptorWithKey:@"dateStart" ascending:YES];
    fetchRequest.sortDescriptors = @[descriptor];
    NSPredicate *predicate = [NSPredicate predicateWithFormat:
                              @"tijd_dag = %@",strDate];
    [fetchRequest setPredicate:predicate];
    NSArray *matches = [context executeFetchRequest:fetchRequest error:nil];
    appointments = [matches mutableCopy];

所以我觉得我的关系已经搞砸了？

EDIT

我正在使用 Restkit 将我的约会映射到我的核心数据库中。根据下面的评论，我决定关闭约会实体内位置属性的选项标志。因为约会总是要有地点的。

现在当我第一天加载时。一切正常。但是当我第二天尝试加载时，我收到错误：The operation couldn\U2019t be completed. (Cocoa error 1570.)现在，当我查看详细的错误时

DetailedError: {
    NSLocalizedDescription = "The operation couldn\U2019t be completed. (Cocoa error 1570.)";
    NSValidationErrorKey = location;
    NSValidationErrorObject = "<Appointment: 0x864e2f0> (entity: Appointment; id: 0x9272c70 <x-coredata://9692683D-3077-4362-9253-652AC5B36444/Appointment/p9> ; data: {\n    autouur = 1;\n    breekuur = 0;\n    data1 = \"\";\n    data2 = \"\";\n    data3 = \"\";\n    data4 = \"\";\n    data5 = \"\";\n    data6 = \"\";\n    data7 = \"\";\n    data8 = \"\";\n    data9 = \"\";\n    dateStart = \"2013-10-23 09:00:00 +0000\";\n    dateStop = \"2013-10-23 09:30:00 +0000\";\n    duration = 30;\n    email = \"\";\n    entryID = 774294984959;\n    info = \"\";\n    \"is_blocked\" = 0;\n    \"is_except\" = 0;\n    \"is_free\" = 1;\n    \"is_moved\" = 0;\n    \"is_vert\" = 0;\n    locatieID = 773150;\n    location = nil;\n    multiID = nil;\n    serverEntryID = 774294984959;\n    serverLocatieID = 773150;\n    sms = \"\";\n    \"tijd_dag\" = 20131023;\n    \"tijd_uur\" = 900;\n})";
}

这就是我在核心数据中加载 JSON 的方式

-(void)getAppointmentsForDate:(NSString *)date forUserID:(NSString *)userID{
    API *api = [API new];
    RKManagedObjectStore *store = [[SanMaxDataModel sharedDataModel] objectStore];
    NSLog(@"store is %@",store);
    NSManagedObjectContext *context = store.mainQueueManagedObjectContext;
    RKObjectManager *objectManager = [api mapAppointments];

    NSString *urlString = [NSString stringWithFormat:@"/doctor/1.0/json/nl/appointments/get-by-date/apikey/%@?uid=%@&date=%@",APIKey,userID,date];
   // NSString *urlString = [NSString stringWithFormat:@"/doctor/1.0/json/nl/appointments/get-by-date/apikey/%@?uid=77382&date=%@",APIKey,date];


    NSURLRequest *request = [objectManager requestWithObject:nil method:RKRequestMethodGET path:urlString parameters:nil];
    RKManagedObjectRequestOperation *operation = [objectManager managedObjectRequestOperationWithRequest:request managedObjectContext:context success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
        NSLog(@"TILL HERE IN METHOD");
        NSError *error = nil;
        [[NSNotificationCenter defaultCenter] postNotificationName:@"appointmentsLoaded" object:self];
      [[SanMaxDataModel sharedDataModel] saveToPersistentStoreAsync:&error];
     } failure:^(RKObjectRequestOperation *operation, NSError *error) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error"
                                                        message:[error localizedDescription]
                                                       delegate:nil
                                              cancelButtonTitle:@"OK"
                                              otherButtonTitles:nil];
        [alert show];
        NSLog(@"Hit error: %@", error);

    }];
    [objectManager enqueueObjectRequestOperation:operation];
}

看来您的问题是，默认情况下，RestKit 在执行新映射时会替换关系的内容。您需要告诉它您想要新的与旧的关系数据。通过设置来做到这一点：

relationshipMapping.assignmentPolicy = RKAssignmentPolicyUnion;

如果您使用旧版本的 RestKit，则需要使用RKUnionAssignmentPolicy.

Where relationshipMapping是你的RKRelationshipMapping实例。