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Re: Counting instances in Core Data

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Re: Counting instances in Core Data

Subject: Re: Counting instances in Core Data
From: Ben Trumbull <email@hidden>
Date: Tue, 29 Apr 2008 13:57:35 -0700

> In Tiger that was the best means available, but if you're targeting Leopard

 there is a better option available:

  Create your fetch request to fetch all instances of a given entity and
 execute the fetch with countForFetchRequest:error: which will simply return
 the number of instances/rows that match your query.


  Though Steve mentioned off-list that he's targeting Tiger, I had
managed to completely forget about this method - my apologies for the
misinformation.

Well, it's probably best to ask the NSManagedObjectContext -respondsToSelector:@selector(countForFetchRequest:error:) and use the slow -executeFetchRequest:error: if the result is NO.

--

-Ben
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