Question

核心数据允许我保存，但当我尝试删除该对象时，我收到以下错误：

*** Terminating app due to uncaught exception 'NSObjectInaccessibleException', reason: 'CoreData could not fulfill a fault for '0xa6b7e00 <x-coredata://8A687ECB-03F8-47C0-8470-087B9CF032B1-2801-00000A8C9A09CDB7/Notification/p2774005D-4B49-4378-A109-949F15D37032>'＆＃39;

[self.managedObjectContext executeFetchRequest:allFetchRequest onSuccess:^(NSArray *results) {
                NSLog(@"Fetch for Objects with origial_id");
                if (results.count>0)
                {
                    NSLog(@"original_id =  %@", dlPlanDate.original_id);
                    NSLog(@"Results Recieved %i", results.count);
                    for (PlanDate *pd in results)
                    {
                        PlanDateResolved *pdResolved = [NSEntityDescription insertNewObjectForEntityForName:@"PlanDateResolved" inManagedObjectContext:self.managedObjectContext];
                        NSArray *keys = [[[pd entity] attributesByName] allKeys];
                        NSDictionary *dict= [pd dictionaryWithValuesForKeys:keys];
                        [pdResolved setValuesForKeysWithDictionary:dict];
                        [pdResolved setValue:[pd plandate_id] forKey:[pdResolved primaryKeyField]];
                        pdResolved.senderUser = pd.senderUser;
                        pdResolved.objectCreator = pd.objectCreator;
                        pdResolved.users = pd.users;
                        NSLog(@"pd.planDateID %@", pd.plandate_id);
                        [self.managedObjectContext saveOnSuccess:^{

                        NSLog(@"Saving Each Object in the Array  to PlanDateResolved with Original ID");
                            [self.managedObjectContext deleteObject:pd];
                            [self.managedObjectContext saveOnSuccess:^{
                                NSLog(@"Deleted the pd Object object!");
                            } onFailure:^(NSError *error) {
                                NSLog(@"There was an error Deleting pd Object %@", error);
                            }];
                        } onFailure:^(NSError *error) {
                        }];
                    }
                }
            } onFailure:^(NSError *error) {
                NSLog(@"Error fetching: %@", error);
            }];
        }

日志：

2013-10-11 11:53:11.175 ST[2801:c07] Fetch for Objects with origial_id
2013-10-11 11:53:11.175 ST[2801:c07] original_id =  CFADD5A7-C9E8-48B3-91B2-56FDBC0F9BAB
2013-10-11 11:53:11.175 ST[2801:c07] Results Recieved 3
2013-10-11 11:53:11.180 ST[2801:c07] pd.planDateID CFADD5A7-C9E8-48B3-91B2-56FDBC0F9BAB
2013-10-11 11:53:11.182 ST[2801:c07] pd.planDateID 5917071A-8CFD-4C7C-A60F-A76FA4814429
2013-10-11 11:53:11.183 ST[2801:c07] pd.planDateID 1998BB90-D6FC-4226-977C-3414C4A57078
2013-10-11 11:53:11.913 ST[2801:c07] You updated the Accepted object!
2013-10-11 11:53:11.913 ST[2801:c07] Saving Each Object in the Array  to PlanDateResolved with Original ID
2013-10-11 11:53:11.913 ST[2801:c07] Saving Each Object in the Array  to PlanDateResolved with Original ID
2013-10-11 11:53:12.155 ST[2801:c07] Saving Each Object in the Array  to PlanDateResolved with Original ID
2013-10-11 11:53:35.482 ST[2801:c07] *** Terminating app due to uncaught exception 'NSObjectInaccessibleException', reason: 'CoreData could not fulfill a fault for '0xa6b7e00 <x-coredata://8A687ECB-03F8-47C0-8470-087B9CF032B1-2801-00000A8C9A09CDB7/Notification/p2774005D-4B49-4378-A109-949F15D37032>''
*** First throw call stack:
(0x24e7012 0x1cfae7e 0x1a20a48 0x1a515e8 0x1ac2879 0x1a59627 0x1a59271 0x1ace025 0x1a53cc1 0x1e7f014 0x1e6ed5f 0x1e6eaa3 0x1a53c8b 0x1a53aee 0x1a30eac 0x1ab0c1 0x1a5398f 0x1e7f014 0x1e6f7d5 0x248daf5 0x248cf44 0x248ce1b 0x24027e3 0x2402668 0x92effc 0x418d 0x25c5)
libc++abi.dylib: terminate called throwing an exception

Answer 1

当托管对象无法访问时，表示Core Data无法在持久性存储文件中找到该对象。这可能有几个原因。

我不知道executeFetchRequest:onSuccess:和saveOnSuccess:来自哪里，但假设他们做了他们的方法名称所暗示的（并且没有可怕的错误），代码中没有明显的理由上面为什么会发生这种情况。所以它正在发生在你正在其他地方做的工作的副作用。

最有可能的是：您还要在其他地方删除这些对象，并且在执行提取之后但代码崩溃之前的某个时间发生此删除。结果，当上面的代码试图删除它们时，它们已经消失了。它出现你正在使用的神秘核心数据方法是异步运行的（基于你在到达崩溃点之前多次打印pd.planDateID这一事实），所以这可能是相同的线程或不同的线程。

[所有这些假设您的日志语句实际上来自您发布的代码。这有点令人怀疑，因为日志包含一条消息，读取“你更新了接受的对象！”，它没有出现在代码中。]

Answer 2

如果您尝试在错误的NSManagedObjectContext中访问NSManagedObject，通常会发生这种情况。如果从UI线程使用托管对象（直接显示数据或在主线程上进行操作），则需要使用NSMainQueueConcurrencyType并发。

此外，如果您在后台线程上使用对象，则它应该是具有NSPrivateQueueConcurrencyType并发性的智能上下文。

Answer 3

查看错误的时间戳。很明显，您已经尝试在其他地方访问已删除的托管对象。汤姆和雷伊的解释是正确的。该对象不可访问，因为它不存在于持久性存储中。

您应该检查代码中您可能仍然可以引用托管对象的代码，并确保在删除托管对象后不再尝试访问它。

核心数据：尝试删除时出现'NSObjectInaccessibleException'。

3 个答案: