Core Data结构修改后，在AppStore中更新升级crash的问题.

问题描述：

在苹果的错误收集中有这么一个问题：

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：

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1. BUG监听报告:
2. 手机型号: iPhone OS , 版本: 4.3
3. 程序名称: xxx, 版本：1.3
4. 用户: xxx
5. 2011-11-13 16:17:31.506 [11747:307] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'This NSPersistentStoreCoordinator has no persistent stores. It cannot perform a save operation.'
6. *** Call stack at first throw:
7. (
8. 0 CoreFoundation 0x344aaed3 __exceptionPreprocess + 114
9. 1 libobjc.A.dylib 0x33975811 objc_exception_throw + 24
10. 2 CoreData 0x338f29c1 -[NSPersistentStoreCoordinator executeRequest:withContext:error:] + 196
11. 3 CoreData 0x3389253d -[NSManagedObjectContext save:] + 700
12. 4 0x00045145 -[XMPPCapabilitiesCoreDataStorage setCapabilities:forHash:algorithm:] + 444
13. 5 0x00042121 -[XMPPCapabilities xmppStream:willSendPresence:] + 232
14. 6 0x0003ca57 -[XMPPStream sendElement:withTag:] + 342
15. 7 0x0003c8f5 -[XMPPStream sendElement:] + 28
16. 8 0x0004592f -[iPhoneXMPP goOnline] + 54

解决办法：
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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1. - (NSPersistentStoreCoordinator *)persistentStoreCoordinator {
3. if (persistentStoreCoordinator != nil) {
4. return persistentStoreCoordinator;
5. }
7. NSURL *storeUrl = [NSURL fileURLWithPath: [[self applicationDocumentsDirectory] stringByAppendingPathComponent: @"database.sqlite"]];
9. NSError *error = nil;
10. NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
11. [NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption,
12. [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil];
13. persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]];
14. if (![persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:options error:&error]) {
15. // Handle error
16. }
18. return persistentStoreCoordinator;
19. }

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