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Model Key path for @sum of attribute of related entity

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Model Key path for @sum of attribute of related entity

Subject: Model Key path for @sum of attribute of related entity
From: Stefan <email@hidden>
Date: Mon, 7 Aug 2006 18:39:56 +0200

How to I get the sum of attribute 'val' of entity 'tr' related to entity 'ac'.

'ac' relates to 'tr' using the attribute 'ac2tr'.

Using 'arrangedObjects' for an 'ac' NSArrayController, I tried

	email@hidden

and got this error message:

[<_NSFaultingMutableSet 0x3c42e0> addObserver:forKeyPath:options:context:] is not supported. Key path: @sum. val

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