我正在为我的应用程序使用 restkit 0.10.2。我有不同的表，其中数据从服务器获取并存储到数据库中。
我有三张表，一张主表和两张子表。两个子表都与主表具有一对一的关系。
我有两个不同的视图控制器 V1 和 V2，我在其中调用 web 服务并将数据映射到表 Child1 和 Child2 中。Child1、Child2 和 Master 表将 userID 作为主键。
当我单击 ViewController V1/V2 时，正在执行以下过程。
1) Getting Data from Server.
2) Delete UserID from Child1/Child2 table(if any), not deleting details in Master Table. Delete Rule is nullify.
3) Map userID to Child1/Child2 Table and Other Details(name, age, userId etc) with Master Table.
映射代码：
RKManagedObjectMapping *userDetailMapping = [RKManagedObjectMapping mappingForClass:[Master class] inManagedObjectStore:manager.objectStore];
[userDetailMapping mapKeyPath:@"uid" toAttribute:@"userID"];
[userDetailMapping mapKeyPath:@"ne" toAttribute:@"name"];
[userDetailMapping mapKeyPath:@"email" toAttribute:@"email"];
[manager.mappingProvider setMapping:userDetailMapping forKeyPath:@"users"];
userDetailMapping.primaryKeyAttribute = @"userID";
RKManagedObjectMapping *userkeyMapping1 = [RKManagedObjectMapping mappingForClass:[Child1 class] inManagedObjectStore:manager.objectStore];
[userkeyMapping1 mapKeyPath:@"uk" toAttribute:@"userID"];
userkeyMapping1.primaryKeyAttribute = @"userID";
[manager.mappingProvider setMapping:userkeyMapping1 forKeyPath:@"usk1"];
RKManagedObjectMapping *userkeyMapping2 = [RKManagedObjectMapping mappingForClass:[Child2 class] inManagedObjectStore:manager.objectStore];
[userkeyMapping2 mapKeyPath:@"uk" toAttribute:@"userID"];
userkeyMapping2.primaryKeyAttribute = @"userID";
[manager.mappingProvider setMapping:userkeyMapping2 forKeyPath:@"usk2"];
连接关系
[userkeyMapping1 hasOne:@"userDetail" withMapping:userDetailMapping];
[userkeyMapping1 connectRelationship:@"userDetail" withObjectForPrimaryKeyAttribute:@"userID"];
[userDetailMapping hasOne:@"userDetail1" withMapping:userkeyMapping1];
[userDetailMapping connectRelationship:@"userDetail1" withObjectForPrimaryKeyAttribute:@"userID"];
[userkeyMapping2 hasOne:@"userDetail" withMapping:userDetailMapping];
[userkeyMapping2 connectRelationship:@"userDetail" withObjectForPrimaryKeyAttribute:@"userID"];
[userDetailMapping hasOne:@"userDetail2" withMapping:userkeyMapping2];
[userDetailMapping connectRelationship:@"userDetail2" withObjectForPrimaryKeyAttribute:@"userID"];
从 DB 中删除 Child1 和 Child2 的对象
- (void)clearUserKeyTable {
RKObjectManager *manager = [[RestKit sharedDataManager] objectManager];
NSManagedObjectContext *context = [Child1 currentContext];
NSArray *objects = [Child1 findAll];
for (Child1 *object in objects) {
[context deleteObject:object];
}
NSError *saveError = nil;
[context save:&saveError];
NIDPRINT(@"All records are deleted - %@", saveError);
for (Child1 *object in objects) {
[context refreshObject:object mergeChanges:NO];
}
[context save:&saveError];
NIDPRINT(@"All records are deleted in Nearby- %@", saveError);
}
注意：两个视图 1 将在 3 分钟后自动刷新。因此，无论屏幕如何，获取和映射操作都将执行。
问题：有时我在 VC1 中手动刷新页面时，它会崩溃。我不知道确切的原因。在我的模拟器中，它显示为
'NSObjectInaccessibleException', reason: 'CoreData could not fulfill a fault for '0x8a5b410 <x-coredata:/XXXX-XXXX-XXXX/Child1/p128>.
当我使用我的设备进行调试时，它会引发异常，这是一个崩溃日志
Path: /var/mobile/Applications/25FD9991-8134-476D-AADE-66D95BFC3C5B/MyApp.app/MyApp
Identifier: MyApp
Version: ??? (???)
Code Type: ARM (Native)
Parent Process: launchd [1]
Date/Time: 2013-02-25 23:17:27.645 -0600
OS Version: iOS 6.0.1 (10A523)
Report Version: 104
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Crashed Thread: 10
Last Exception Backtrace:
0 CoreFoundation 0x3147329e __exceptionPreprocess + 158
1 libobjc.A.dylib 0x3233197a objc_exception_throw + 26
2 CoreData 0x32741b38 _PFFaultHandlerLookupRow + 1472
3 CoreData 0x327430fa _PF_FulfillDeferredFault + 198
4 CoreData 0x3274ac0c _PF_ManagedObject_WillChangeValueForKeyIndex + 64
5 CoreData 0x3275532e _sharedIMPL_setvfk_core + 106
6 CoreData 0x327497c2 _PF_Handler_Public_SetProperty + 54
7 CoreData 0x32750a4c -[NSManagedObject(_NSInternalMethods) _maintainInverseRelationship:forProperty:oldDestination:newDestination:] + 328
8 CoreData 0x32751216 -[NSManagedObject(_NSInternalMethods) _didChangeValue:forRelationship:named:withInverse:] + 1286
9 CoreData 0x3275a82e -[NSManagedObjectContext observeValueForKeyPath:ofObject:change:context:] + 318
10 Foundation 0x32fd4eac NSKeyValueNotifyObserver + 268
11 Foundation 0x32fd4b06 NSKeyValueDidChange + 330
12 Foundation 0x32faeec6 -[NSObject(NSKeyValueObserverNotification) didChangeValueForKey:] + 90
13 CoreData 0x3274ae26 _PF_ManagedObject_DidChangeValueForKeyIndex + 98
14 CoreData 0x327553a2 _sharedIMPL_setvfk_core + 222
15 CoreData 0x327497c2 _PF_Handler_Public_SetProperty + 54
16 CoreData 0x32750ad6 -[NSManagedObject(_NSInternalMethods) _maintainInverseRelationship:forProperty:oldDestination:newDestination:] + 466
17 CoreData 0x32751216 -[NSManagedObject(_NSInternalMethods) _didChangeValue:forRelationship:named:withInverse:] + 1286
18 CoreData 0x3275a82e -[NSManagedObjectContext observeValueForKeyPath:ofObject:change:context:] + 318
19 Foundation 0x32fd4eac NSKeyValueNotifyObserver + 268
20 Foundation 0x32fd4b06 NSKeyValueDidChange + 330
21 Foundation 0x32faeec6 -[NSObject(NSKeyValueObserverNotification) didChangeValueForKey:] + 90
22 CoreData 0x3274ae26 _PF_ManagedObject_DidChangeValueForKeyIndex + 98
23 CoreData 0x327553a2 _sharedIMPL_setvfk_core + 222
24 CoreData 0x327497c2 _PF_Handler_Public_SetProperty + 54
25 CoreData 0x3274bd1e -[NSManagedObject setValue:forKey:] + 86
26 Foundation 0x32faf71e -[NSObject(NSKeyValueCoding) setValue:forKeyPath:] + 294
27 MyApp 0x0019aa5c -[RKManagedObjectMappingOperation connectRelationship:] (RKManagedObjectMappingOperation.m:100)
28 MyApp 0x0019af16 __55-[RKManagedObjectMappingOperation connectRelationships]_block_invoke_0 (RKManagedObjectMappingOperation.m:115)
29 Foundation 0x32fdc534 -[NSBlockOperation main] + 196
30 Foundation 0x32fd3db4 -[__NSOperationInternal start] + 836
31 MyApp 0x001b063c -[RKMappingOperationQueue waitUntilAllOperationsAreFinished] (RKMappingOperationQueue.m:53)
32 MyApp 0x001b6496 -[RKObjectMapper performMapping] (RKObjectMapper.m:368)
33 MyApp 0x001b14f0 -[RKObjectLoader mapResponseWithMappingProvider:toObject:inContext:error:] (RKObjectLoader.m:227)
34 MyApp 0x001b18c2 -[RKObjectLoader performMapping:] (RKObjectLoader.m:271)
35 MyApp 0x001b1a9e __47-[RKObjectLoader performMappingInDispatchQueue]_block_invoke_0 (RKObjectLoader.m:282)
36 libdispatch.dylib 0x33a6311a _dispatch_call_block_and_release + 6
37 libdispatch.dylib 0x33a62996 _dispatch_queue_drain$VARIANT$up + 142
38 libdispatch.dylib 0x33a62890 _dispatch_queue_invoke$VARIANT$up + 32
39 libdispatch.dylib 0x33a71210 _dispatch_root_queue_drain + 188
40 libdispatch.dylib 0x33a713b4 _dispatch_worker_thread2 + 80
41 libsystem_c.dylib 0x33aa1a0c _pthread_wqthread + 356
42 libsystem_c.dylib 0x33aa18a0 start_wqthread + 4
线程 10 崩溃
Thread 10 name: Dispatch queue: org.restkit.ObjectMapping
Thread 10 Crashed:
0 libsystem_kernel.dylib 0x30661350 __pthread_kill + 8
1 libsystem_c.dylib 0x33aca11e pthread_kill + 54
2 libsystem_c.dylib 0x33b0696e abort + 90
3 libc++abi.dylib 0x314e7d4a abort_message + 70
4 libc++abi.dylib 0x314e4ff4 _ZL17default_terminatev + 20
5 libobjc.A.dylib 0x32331a74 _ZL15_objc_terminatev + 144
6 libc++abi.dylib 0x314e5078 _ZL19safe_handler_callerPFvvE + 76
7 libc++abi.dylib 0x314e5110 std::terminate() + 16
8 libc++abi.dylib 0x314e6594 __cxa_rethrow + 84
9 libobjc.A.dylib 0x323319cc objc_exception_rethrow + 8
10 CoreData 0x32741f60 _PFFaultHandlerLookupRow + 2536
11 CoreData 0x327430fa _PF_FulfillDeferredFault + 198
12 CoreData 0x3274ac0c _PF_ManagedObject_WillChangeValueForKeyIndex + 64
13 CoreData 0x3275532e _sharedIMPL_setvfk_core + 106
14 CoreData 0x327497c2 _PF_Handler_Public_SetProperty + 54
15 CoreData 0x32750a4c -[NSManagedObject(_NSInternalMethods) _maintainInverseRelationship:forProperty:oldDestination:newDestination:] + 328
16 CoreData 0x32751216 -[NSManagedObject(_NSInternalMethods) _didChangeValue:forRelationship:named:withInverse:] + 1286
17 CoreData 0x3275a82e -[NSManagedObjectContext observeValueForKeyPath:ofObject:change:context:] + 318
18 Foundation 0x32fd4eac NSKeyValueNotifyObserver + 268
19 Foundation 0x32fd4b06 NSKeyValueDidChange + 330
20 Foundation 0x32faeec6 -[NSObject(NSKeyValueObserverNotification) didChangeValueForKey:] + 90
21 CoreData 0x3274ae28 _PF_ManagedObject_DidChangeValueForKeyIndex + 100
22 CoreData 0x327553a2 _sharedIMPL_setvfk_core + 222
23 CoreData 0x327497c2 _PF_Handler_Public_SetProperty + 54
24 CoreData 0x32750ad6 -[NSManagedObject(_NSInternalMethods) _maintainInverseRelationship:forProperty:oldDestination:newDestination:] + 466
25 CoreData 0x32751216 -[NSManagedObject(_NSInternalMethods) _didChangeValue:forRelationship:named:withInverse:] + 1286
26 CoreData 0x3275a82e -[NSManagedObjectContext observeValueForKeyPath:ofObject:change:context:] + 318
27 Foundation 0x32fd4eac NSKeyValueNotifyObserver + 268
28 Foundation 0x32fd4b06 NSKeyValueDidChange + 330
29 Foundation 0x32faeec6 -[NSObject(NSKeyValueObserverNotification) didChangeValueForKey:] + 90
30 CoreData 0x3274ae28 _PF_ManagedObject_DidChangeValueForKeyIndex + 100
31 CoreData 0x327553a2 _sharedIMPL_setvfk_core + 222
32 CoreData 0x327497c2 _PF_Handler_Public_SetProperty + 54
33 CoreData 0x3274bd1e -[NSManagedObject setValue:forKey:] + 86
34 Foundation 0x32faf71e -[NSObject(NSKeyValueCoding) setValue:forKeyPath:] + 294
35 MyApp 0x0019aa5c -[RKManagedObjectMappingOperation connectRelationship:] (RKManagedObjectMappingOperation.m:100)
36 MyApp 0x0019af16 __55-[RKManagedObjectMappingOperation connectRelationships]_block_invoke_0 (RKManagedObjectMappingOperation.m:115)
37 Foundation 0x32fdc536 -[NSBlockOperation main] + 198
38 Foundation 0x32fd3db4 -[__NSOperationInternal start] + 836
39 MyApp 0x001b063c -[RKMappingOperationQueue waitUntilAllOperationsAreFinished] (RKMappingOperationQueue.m:53)
40 MyApp 0x001b6496 -[RKObjectMapper performMapping] (RKObjectMapper.m:368)
41 MyApp 0x001b14f0 -[RKObjectLoader mapResponseWithMappingProvider:toObject:inContext:error:] (RKObjectLoader.m:227)
42 MyApp 0x001b18c2 -[RKObjectLoader performMapping:] (RKObjectLoader.m:271)
43 MyApp 0x001b1a9e __47-[RKObjectLoader performMappingInDispatchQueue]_block_invoke_0 (RKObjectLoader.m:282)
44 libdispatch.dylib 0x33a6311c _dispatch_call_block_and_release + 8
45 libdispatch.dylib 0x33a62996 _dispatch_queue_drain$VARIANT$up + 142
46 libdispatch.dylib 0x33a62890 _dispatch_queue_invoke$VARIANT$up + 32
47 libdispatch.dylib 0x33a71212 _dispatch_root_queue_drain + 190
48 libdispatch.dylib 0x33a713b4 _dispatch_worker_thread2 + 80
49 libsystem_c.dylib 0x33aa1a0e _pthread_wqthread + 358
50 libsystem_c.dylib 0x33aa18a0 start_wqthread + 4
谢谢