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Re: Error with proxy objects and to-many relationships with Core Data

Subject: Re: Error with proxy objects and to-many relationships with Core Data
From: mmalcolm crawford <email@hidden>
Date: Sun, 26 Feb 2006 19:55:23 -0800
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On Feb 26, 2006, at 7:35 PM, Sean Willson wrote:

Does anyone have any ideas on how to diagnose this problem?

This has nothing to do with Core Data.

As the documentation states:

"selection
Returns a proxy object representing the receiver’s selection."

<http://developer.apple.com/documentation/Cocoa/Reference/ ApplicationKit/ObjC_classic/Classes/NSObjectController.html#// apple_ref/occ/instm/NSObjectController/selection>

The method returns a *proxy*, not the actual object. So you can't use it as an "ordinary" object. If you need the actual object, use:

	[[fooBarController selectedObjects] objectAtIndex:0];

In general there aren't that many good large scale core data references out on the web right now and it's quite painful. I am working on a detail application that is quite dependent on Core Data and find the documentation to be quite sparse.

If you find deficits in the documentation, please file enhancement requests. Please also bear in mind that, as in this case, many "issues" with Core Data are not specific to Core Data...

mmalc

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