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Re: Finding the largest value in an NSTreeController?
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Re: Finding the largest value in an NSTreeController?


  • Subject: Re: Finding the largest value in an NSTreeController?
  • From: Rick Mann <email@hidden>
  • Date: Sat, 31 May 2008 13:12:16 -0700


On May 31, 2008, at 12:05:58, I. Savant wrote:

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.).


Wow, really? No way to just get at all the items in the tree controller with some key path, then use @max? It seems that this would be possible with an NSArray:

http://developer.apple.com/documentation/Cocoa/Conceptual/KeyValueCoding/Concepts/ArrayOperators.html#/ /apple_ref/doc/uid/20002176

TIA,

--
Rick

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  • Follow-Ups:
    • Re: Finding the largest value in an NSTreeController?
      • From: "I. Savant" <email@hidden>
References: 
 >Finding the largest value in an NSTreeController? (From: Rick Mann <email@hidden>)
 >Re: Finding the largest value in an NSTreeController? (From: Jonathan Dann <email@hidden>)
 >Re: Finding the largest value in an NSTreeController? (From: Rick Mann <email@hidden>)
 >Re: Finding the largest value in an NSTreeController? (From: "I. Savant" <email@hidden>)

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