Objective c RestKit 0.20映射问题

当我发出请求并试图将响应放入核心数据时，会出现以下错误

Performing managed object mapping with a nil managed object cache:
Unable to update existing object instances by identification attributes. Duplicate objects     may be created.

我设置了identifactionAttributes，并使用对象管理器配置请求操作。我仍然收到“无法更新现有对象实例…”

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我没有配置与对象管理器的核心数据集成。如果您有同样的问题，您应该这样做：

NSManagedObjectModel *managedObjectModel = [NSManagedObjectModel mergedModelFromBundles:nil];
RKManagedObjectStore *managedObjectStore = [[RKManagedObjectStore alloc] initWithManagedObjectModel:managedObjectModel];
NSString *path = [RKApplicationDataDirectory() stringByAppendingPathComponent:@"Store.sqlite"];
[managedObjectStore addSQLitePersistentStoreAtPath:path fromSeedDatabaseAtPath:nil withConfiguration:nil options:nil error:nil];
[managedObjectStore createManagedObjectContexts];

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你收到的信息只是一个警告。你只是想摆脱这个警告吗？还是你有更大的问题？数据库中根本没有存储对象吗？数据库中没有存储对象。。。

NSManagedObjectModel *managedObjectModel = [NSManagedObjectModel mergedModelFromBundles:nil];
RKManagedObjectStore *managedObjectStore = [[RKManagedObjectStore alloc] initWithManagedObjectModel:managedObjectModel];
NSString *path = [RKApplicationDataDirectory() stringByAppendingPathComponent:@"Store.sqlite"];
[managedObjectStore addSQLitePersistentStoreAtPath:path fromSeedDatabaseAtPath:nil withConfiguration:nil options:nil error:nil];
[managedObjectStore createManagedObjectContexts];