ios - 核心数据异常: initWithCoder:]: unrecognized selector sent

Question

我在使用 Core Data 时遇到了这个问题。

CoreData: error: exception during fetchRowForObjectID: -[PharmaceuticalComp initWithCoder:]: unrecognized selector sent to instance 0x9ab1920 with userInfo of (null)
2014-08-18 07:56:55.784 HorizonMemory[1357:60b] CoreData: error: Serious application error.  Exception was caught during Core Data change processing.  This is usually a bug within an observer of NSManagedObjectContextObjectsDidChangeNotification.  -[PharmaceuticalComp initWithCoder:]: unrecognized selector sent to instance 0x9ab1920 with userInfo (null)
2014-08-18 07:56:55.786 HorizonMemory[1357:60b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[PharmaceuticalComp initWithCoder:]: unrecognized selector sent to instance 0x9ab1920'
*** First throw call stack:
(
    0   CoreFoundation                      0x021981e4 __exceptionPreprocess + 180
    1   libobjc.A.dylib                     0x01f178e5 objc_exception_throw + 44
    2   CoreFoundation                      0x02235243 -[NSObject(NSObject) doesNotRecognizeSelector:] + 275
    3   CoreFoundation                      0x0218850b ___forwarding___ + 1019
    4   CoreFoundation                      0x021880ee _CF_forwarding_prep_0 + 14
    5   Foundation                          0x01b2a01a _decodeObjectBinary + 3498
    6   Foundation                          0x01b2b4d7 -[NSKeyedUnarchiver _decodeArrayOfObjectsForKey:] + 2204
    7   Foundation                          0x01b2b746 -[NSArray(NSArray) initWithCoder:] + 255
    8   Foundation                          0x01b2a01a _decodeObjectBinary + 3498
    9   Foundation                          0x01b2b4d7 -[NSKeyedUnarchiver _decodeArrayOfObjectsForKey:] + 2204
    10  Foundation                          0x01b37ff1 -[NSDictionary(NSDictionary) initWithCoder:] + 261
    11  Foundation                          0x01b2a01a _decodeObjectBinary + 3498
    12  Foundation                          0x01b29106 _decodeObject + 340
    13  Foundation                          0x01b28faa -[NSKeyedUnarchiver decodeObjectForKey:] + 181
    14  Foundation                          0x01b9aa86 +[NSKeyedUnarchiver unarchiveObjectWithData:] + 106
    15  Foundation                          0x01b197d5 -[_NSKeyedUnarchiveFromDataTransformer transformedValue:] + 47
    16  CoreData                            0x024205b9 _prepareResultsFromResultSet + 4105
    17  CoreData                            0x0241de33 newFetchedRowsForFetchPlan_MT + 1

PharmaComp 是一个 NSManaged 子类，通过 transient 属性 -linkedPharma 链接到另一个实体 User。用户在只读模式下拥有此属性。每次我调用 linkedPharma 时，它都会启动一个获取请求，为我提供 PharmaComp 实例。当我尝试删除用户时，出现此异常。奇怪的是 linkedPharma 是模型中未列出的属性，因此 PharmaComp 不应参与任何类型的操作。另一个事实是它似乎尝试在其上使用 NSKeyedUnarchivier，但我不明白为什么.
没有对象听到 NSManagedObjectContextObjectsDidChangeNotification。
我不知道它来自哪里。

Answer 1

解决方案非常简单。
用户还与可变形容器 (NSArray) 存在另一种关系，该容器保存(针对错误)PharmaComp 实例。