On 2010 Jul 28, at 20:07, Gideon King wrote:

> Thanks Jerry, it is part of an NSPersistentDocument subclass. I get a bit 
> confused about which save method(s) I would have to implement in my subclass, 
> as there seem to be a number of save... methods and a number of writeTo... 
> methods. The potential candidates seem to be...

No need to guess!  Paste "Message Flow in the Document Architecture" into your 
Xcode documentation viewer.  Up near the top hit should be a page with that 
title in "Document-Based Applications Overview", which is the most usefully 
lucid page of documentation ever produced by Apple.  It has some wonderful 
diagrams including one for "Saving a Document".

Unfortunately it doesn't show the topmost stack calls for Core Data (I've filed 
a bug), but you can see where it leaves off, knowing that NSPersistentDocument 
overrides writeToURL:ofType:forSaveOperation:originalContentsURL:error:.  
Anything under that works just like it says.


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