CoreData如何检测新版本的应用程序，以便我可以更新模型？

我有一个非常简单的模型，当应用程序第一次启动并填充plist的内容时创建。当下载并启动应用更新时，我需要重新创建模型。我知道你可以版本coredata模型，但我不知道模型本身会改变。我只需要通过现有的对象数组，并从plist添加新的对象。为此，我需要检查应用程序的版本号，并以某种方式检测它与设备上的模型不同。

I have a very simple model that is created when the app is launched for the very first time and populated with the contents of a plist. I will need to re-create the model again when an update to the app is downloaded and launched. I know that you can version coredata models but I don't foresee the model itself is going to change. I will just need to go through the existing array of objects and add new objects from the plist. For this I need to check the version number of the app and somehow detect it is different from the model on the device.