The [Core Data Documentation](http://developer.apple.com/documentation/Cocoa/Conceptual/CoreData/Articles/cdRelationships.html#//apple_ref/doc/uid/TP40001857-SW7) states that:

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> The fetch request associated with the [fetched] property can have a sort ordering, and thus the fetched property may be ordered.
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> 
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How do I specify the sort descriptors for the fetched property in Xcode's data model editor? I can't find a relevant field anywhere. I'm developing for the iPhone platform, if this makes any difference.

If this is not possible via the graphical model editor, how do I go about modifying the fetch request for the fetched property in code so that it has a sort descriptor?