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：

[cpp] view
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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：

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- (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

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