如何在没有错误错误的情况下删除每个Core Data实体？

Question

如何刷新该死的Core Data对象？

请原谅,我只想删除对象20分钟.删除就好了,但Core Data会在一段时间后引发异常.

我到目前为止尝试过:

删除所有对象(MR_truncateAll),然后保存.

删除所有对象,处理挂起的更改,保存.

关闭撤消管理器,删除,转回撤消管理器.

删除Core Data sqlite文件,销毁上下文,然后重新创建.

使用[MagicalRecord cleanUp],删除核心数据sqlite文件.

---

尽管如此,当我想创建对象时,经过2-3次尝试后,我将获得Faulting,然后因故障而崩溃.

CoreData could not fulfill a fault for '0xd000000000840002 <x-coredata://...

(
    0   CoreFoundation                      0x0000000102016795 __exceptionPreprocess + 165
    1   libobjc.A.dylib                     0x0000000101d79991 objc_exception_throw + 43
    2   CoreData                            0x0000000100265a93 _PFFaultHandlerLookupRow + 1075
    3   CoreData                            0x00000001002f33a3 -[NSManagedObject(_NSInternalMethods) _updateFromRefreshSnapshot:includingTransients:] + 243
    4   CoreData                            0x0000000100297563 -[NSManagedObjectContext(_NestedContextSupport) _copyChildObject:toParentObject:fromChildContext:] + 771
    5   CoreData                            0x000000010029701b -[NSManagedObjectContext(_NestedContextSupport) _parentProcessSaveRequest:inContext:error:] + 1019
    6   CoreData                            0x00000001002fd243 __82-[NSManagedObjectContext(_NestedContextSupport) executeRequest:withContext:error:]_block_invoke + 563
    7   libdispatch.dylib                   0x0000000102ce005a _dispatch_barrier_sync_f_slow_invoke + 45
    8   libdispatch.dylib                   0x0000000102cef6fd _dispatch_client_callout + 8
    9   libdispatch.dylib                   0x0000000102cdf46c _dispatch_main_queue_callback_4CF + 354
    10  CoreFoundation                      0x0000000102074729 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
    11  CoreFoundation                      0x0000000101fc19a4 __CFRunLoopRun + 1764
    12  CoreFoundation                      0x0000000101fc0ed3 CFRunLoopRunSpecific + 467
    13  GraphicsServices                    0x00000001032f03a4 GSEventRunModal + 161
    14  UIKit                               0x0000000100e48a63 UIApplicationMain + 1010
    15  GitHub!                             0x0000000100002f53 main + 115
    16  libdyld.dylib                       0x0000000102f9c7e1 start + 0
)

我使用单一的上下文.由引擎盖下的MagicalRecord创建.

你如何删除,刷新核心数据？

Answer 1

这应该适合你

[ClassName MR_truncateAll];

[[NSManagedObjectContext MR_defaultContext] MR_saveToPersistentStoreAndWait];

这里的ClassName是您实体的NSManagedObject子类.