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有谁知道类 _NSObjectID_48_1 做什么？

好的，我正在这样做：我在两个日期之间获取对象 Schedule 的属性（描述、日期和个人数据），这也与对象 Operator 有关系，只有一种方式（Schedule -> Operator）。fetch 检索数据，但是当我想访问 Operator 的属性（如“name”）时，应用程序崩溃并告诉我“_NSObjectID_48_1”没有响应选择器。当然，我在获取过程中启用了这一行：

[request setRelationshipKeyPathsForPrefetching:[NSArray arrayWithObject:entityToPrefetch]];

这就是我设置要获取的属性的方式，而不是整个 Schedule 对象。同样在检索数据时，它被设置为“NSDictionaryResultType”，否则它会抱怨无法正确获取数据。

NSEntityDescription *entity = [NSEntityDescription entityForName:@"Operator"
                                                      inManagedObjectContext:[AppDelegate managedObjectContext]];
            NSDictionary *relationship = [entity relationshipsByName];
            NSDictionary *entityProperties = [entity propertiesByName];
            NSArray *properties = [[NSArray alloc] initWithObjects:[entityProperties objectForKey:@"description"],
                                   [entityProperties objectForKey:@"date"],
                                   [relationship objectForKey:@"personalData"],nil];

            NSPredicate *predicate = [NSPredicate predicateWithFormat:@"date >= %@ && \
                                                                        date <= %@",
                                      [dateArray objectAtIndex:0],
                                      [dateArray lastObject]];

schedArray = "执行 FETCH"

SLog(schedArray);
    SLog([schedArray objectAtIndex:0]);
    SLog([[schedArray objectAtIndex:0] objectForKey:@"employee"]);
    VoicePickOperators *employee = (VoicePickOperators *)[[schedArray objectAtIndex:0] objectForKey:@"employee"];
    SLog(employee);
    SLog([employee name]); <<------ Problem, I am trying to access an attribute that should be there but instead is of the type __NSObjectID_48_1
    SLog([employee description]);

有谁知道这是怎么回事？？

谢谢！！

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