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Finding the largest value in an NSTreeController?

Subject: Finding the largest value in an NSTreeController?
From: Rick Mann <email@hidden>
Date: Sat, 31 May 2008 02:35:17 -0700
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I'd like to find the largest integer value of one of my entity fields, stored in an NSTreeController. Is this possible? I'm trying to use "@max", but getting back null on every variant:

	NSNumber* maxVal = [mItemsController valueForKeyPath: @"@max.number"];

I also tried with "arrangedOBjects".

I can't even figure out how to manually iterate the objects. Is there a way?

TIA,
--
Rick

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