On 2010 Sep 13, at 15:38, Jerry Krinock wrote:

> …I found that Xcode accepted my input if I set "Source Fetch" to Default and 
> entered one of these as "Filter Predicate":
> 
>    ($source.beak != nil)      // Bird
>    ($source.beak == nil)      // Fish

Upon studying my situation a little further, I realized that my Birds and Fish 
also needed to be moved to a different managed object context.  (Yup, some 
serious database rework.)  Since Xcode's mapping model editor can't do that, I 
had to delete these Entity Mappings, and instead implement them in code 
(NSEntityMigrationPolicy) where, of course, it worked.

Maybe next time.

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