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How to tell if NSArrayController has a selected CoreData instance?

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How to tell if NSArrayController has a selected CoreData instance?

Subject: How to tell if NSArrayController has a selected CoreData instance?
From: Timothy Reaves <email@hidden>
Date: Mon, 28 Sep 2009 16:28:58 -0500

When you call [anArrayController selection] for an Entity-backed NSArrayController, you always get an instance of _NSControllerObjectProxy back. Even when there is no object selected. It's not until you send a message to that proxy that you get unrecognized selector error.

What is the correct way to determine if that proxy represents an actual entity?

	Thanks!
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