Re: Finding the largest value in an NSTreeController?

FROM : I. Savant
DATE : Sat May 31 21:05:58 2008

> Well, I would have thought so, but I don't know enough about 
> CoreData to actually get at the objects without the tree controller. 
> I would've thought I could do that just off the tree controller, 
> using @max, too.


1 - Create a fetch request for your desired entity.
2 - Create a sort descriptor for the key whose max value you're 
interested in.
3 - Set the fetch request's sort descriptor to the above.
4 - Create any predicates needed for filtration (ie, whatever you may 
or may not have used in the tree controller).
5 - Set the fetch request's predicate to the above if any.
6 - Execute the fetch request and get the last (or first) object of 
the results (checking for errors, minding the set-versus-array 
gotchas, etc.).

--
I.S.