使用coredata导致的版本更新后程序crash的问题

在错误收集中有这么一个问题：我使用的xmpp框架，在调整为适应ios5的版本后出现一个导致程序crash问题。但是原来的xmpp代码没有改变，那么问题在哪呢？

报错如下：

BUG监听报告:
手机型号: iPhone OS , 版本: 4.1
程序名称: Dating, 版本：1.8
用户: 10892386
2011-11-13 16:17:31.506 Taonan[11747:307] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'This NSPersistentStoreCoordinator has no persistent stores. It cannot perform a save operation.'
*** Call stack at first throw:
(
0 CoreFoundation 0x344aaed3 __exceptionPreprocess + 114
1 libobjc.A.dylib 0x33975811 objc_exception_throw + 24
2 CoreData 0x338f29c1 -[NSPersistentStoreCoordinator executeRequest:withContext:error:] + 196
3 CoreData 0x3389253d -[NSManagedObjectContext save:] + 700
4 Taonan 0x00045145 -[XMPPCapabilitiesCoreDataStorage setCapabilities:forHash:algorithm:] + 444
5 Taonan 0x00042121 -[XMPPCapabilities xmppStream:willSendPresence:] + 232
6 Taonan 0x0003ca57 -[XMPPStream sendElement:withTag:] + 342
7 Taonan 0x0003c8f5 -[XMPPStream sendElement:] + 28
8 Taonan 0x0004592f -[iPhoneXMPP goOnline] + 54

在stackoverflow找到解决办法：http://stackoverflow.com/questions/1091228/i-keep-on-getting-save-operation-failure-after-any-change-on-my-xcode-data-mod

需要修改coredata的persistentstorecoordinator的代理实现方法，添加options，使得当coredata数据模型发生变化时，自动更该合并变化。代码如下：

- (NSPersistentStoreCoordinator *)persistentStoreCoordinator {

if (persistentStoreCoordinator != nil) {
return persistentStoreCoordinator;
}

NSURL *storeUrl = [NSURL fileURLWithPath: [[self applicationDocumentsDirectory] stringByAppendingPathComponent: @"database.sqlite"]];

NSError *error = nil;
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption,
[NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil];
persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]];
if (![persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:options error:&error]) {
// Handle error
}

return persistentStoreCoordinator;
}

至于已发布的新版本，如果用户遇到该问题。建议推荐用户删除原来的app后，全新安装app程序，即可解决该问题