iOS coredata 数据库升级 时报Can't find model for source store

 NSError *error = nil;
    NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
                             [NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption,
                             [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption,NSFileProtectionComplete, NSPersistentStoreFileProtectionKey, nil];
    
    _persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
    if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:options error:&error]) {
        
        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        abort();
    }

Your sqlite database‘s model hash MUST match one of the mom or momd created by your xcdatamodel when you build your app. You can see the hashes in the momd‘s VersionInfo.plist in the built app‘s bundle. See below for code to find your database‘s model hash.

So if you change your xcdatamodel instead of creating a new version under Xcode->Editor->Add Model Version... then your model‘s hash will be different, and addPersistentStoreWithType won‘t be able to use your old database, which used the old model. That‘s what causes the "Can‘t find model for source store" error.