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How to sum numbers using NSTableView?

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How to sum numbers using NSTableView?

Subject: How to sum numbers using NSTableView?
From: Sebastijan Bauman <email@hidden>
Date: Sun, 05 Jul 2009 16:43:40 +0200

Hi everyone.

I am using NSTableView and Core Data and would like to sum numbers from two columns and show the sum in third column for every row. Like this:

http://www.shrani.si/f/3r/5h/4MNSm4Th/1/picture-2.png

what is the easiest way to do this? is there a way to do this in Table Column Bindings / Value Transformers (like we do for @sum, @count, etc.) or maybe in xcdatamodel?

thanks for help in advance!
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