亲爱的社区。我尝试从其他线程的主 AppDelegate 中的托管对象上下文中获取一些数据。
NSError *error = nil;
AppDelegate *appDelegate = [[NSApplication sharedApplication] delegate];
NSFetchRequest *requestCodesList = [[[NSFetchRequest alloc] init] autorelease];
[requestCodesList setEntity:[NSEntityDescription entityForName:@"CodesvsDestinationsList"
inManagedObjectContext:[appDelegate managedObjectContext]]];
[requestCodesList setPredicate:[NSPredicate predicateWithFormat:@"(%K.carrier.name == %@) AND (%K.prefix == %@) AND (code == %@) AND (originalCode == %@)",
destinationTypeRelationShipName,
carrierName,
destinationTypeRelationShipName,
prefix,
[destinationParameters valueForKey:@"code"],
[destinationParameters valueForKey:@"originalCode"]]];
//[destinationParameters valueForKey:@"originalCode"]]];
NSLog(@" Predicate is:%@ START",requestCodesList);
NSArray *codesInLocalSystem = [[appDelegate managedObjectContext] executeFetchRequest:requestCodesList error:&error];
我只是从主 MOC 读取信息，所以，这不可能是线程安全的问题，因为我没有在那里写任何东西。问题是某个时候开始。这是我收到的错误:
2010-12-16 12:55:05.162 snow[53293:3a0b] -[NSManagedObject isTemporaryID]: 无法识别的选择器发送到实例 0x11836db00
*** Call stack at first throw:
(
0 CoreFoundation 0x00007fff84cb47b4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x00007fff87ec40f3 objc_exception_throw + 45
2 CoreFoundation 0x00007fff84d0e110 +[NSObject(NSObject) doesNotRecognizeSelector:] + 0
3 CoreFoundation 0x00007fff84c8691f ___forwarding___ + 751
4 CoreFoundation 0x00007fff84c82a68 _CF_forwarding_prep_0 + 232
5 CoreData 0x00007fff85374341 getValueCore + 33
6 CoreData 0x00007fff853742e4 _PFCMT_GetValue + 20
7 CoreData 0x00007fff8537422d -[NSManagedObjectContext(_NSInternalAdditions) _retainedObjectWithID:optionalHandler:withInlineStorage:] + 45
8 CoreData 0x00007fff85376edd _PF_FulfillDeferredFault + 541
9 CoreData 0x00007fff8537aab7 _sharedIMPL_pvfk_core + 87
10 CoreData 0x00007fff8537ac28 -[NSManagedObject(_PFDynamicAccessorsAndPropertySupport) _genericValueForKey:withIndex:flags:] + 40
11 CoreData 0x00007fff853804be -[NSManagedObject valueForKey:] + 270
12 Foundation 0x00007fff854b9f6f -[NSObject(NSKeyValueCoding) valueForKeyPath:] + 357
13 Foundation 0x00007fff854b9f82 -[NSObject(NSKeyValueCoding) valueForKeyPath:] + 376
14 Foundation 0x00007fff8551ca22 -[NSFunctionExpression expressionValueWithObject:context:] + 530
15 Foundation 0x00007fff854e03a7 -[NSComparisonPredicate evaluateWithObject:substitutionVariables:] + 223
16 Foundation 0x00007fff8551c7ba -[NSCompoundPredicateOperator evaluatePredicates:withObject:substitutionVariables:] + 235
17 Foundation 0x00007fff8551c690 -[NSCompoundPredicate evaluateWithObject:substitutionVariables:] + 265
18 CoreData 0x00007fff85364e41 -[NSManagedObjectContext executeFetchRequest:error:] + 1361
19 snow 0x0000000100014a5e -[AppController externalDestinationsForCodeIsAlresdyInLocalDatabaseForCarrierName:withEnabledState:withDestinationParameters:withDestinationTypeRelationShipName:withPrefix:withExternalRateNumber:withAddedDestinations:withCheckForLocalAddedDestinations:] + 862
20 snow 0x00000001000158aa -[AppController updateDestinationListforCarrier:destinationType:] + 2586
21 snow 0x0000000100015d72 -[AppController makeUpdatesForCarrier:andTypeOfOperation:forDirection:] + 754
22 snow 0x00000001000160a1 -[AppController main] + 689
23 Foundation 0x00007fff854d3de4 -[__NSOperationInternal start] + 681
24 Foundation 0x00007fff855b2beb __doStart2 + 97
25 libSystem.B.dylib 0x00007fff84f452c4 _dispatch_call_block_and_release + 15
26 libSystem.B.dylib 0x00007fff84f23831 _dispatch_worker_thread2 + 239
27 libSystem.B.dylib 0x00007fff84f23168 _pthread_wqthread + 353
28 libSystem.B.dylib 0x00007fff84f23005 start_wqthread + 13
)
terminate called after throwing an instance of 'NSException'
最佳答案
为了其他人遇到这个问题 - 您可能正在将 NSManagedObject 子类传递给需要 NSManagedObjectID 的方法。检查您的方法签名是否在 .h 和 .m 文件之间对齐。
关于objective-c - 发送到实例的核心数据奇怪的无法识别的选择器，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/4460070/