ios - 核心数据迁移 : 'Can' t merge models with two different entities. ..'

Question

我向 Core Data 模型添加了新版本。我向一个实体添加了新属性 (Seriese)

但它引发异常

 *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Can't merge models with two different entities named 'Seriese'' 

我使用以下代码:

- (NSPersistentStoreCoordinator *)persistentStoreCoordinator {

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

    NSURL *storeUrl = [NSURL fileURLWithPath: [[self applicationPrivateDocumentsDirectory] stringByAppendingPathComponent: @"CoreDataTutorialPart4.sqlite"]];

    NSError *error = nil;
    persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];

    NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:  
                                            [NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption,  
                                            [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil];


    if (![persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:options error:&error]) {

        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        abort();
    }    

    return persistentStoreCoordinator;
}

有什么解决这个错误的建议吗？我不想丢失保存的数据

Answer 1

问题很可能来自加载托管对象模型的方式。默认方法是合并 bundle 中的模型，但是在这种情况下，您实际上有两个具有相同实体(v1 和 v2)的模型……这里解释得很好……Migration Issues