title: How to fetch section name when using NSFetchedResultsController and sectionNameKeyPath is a relationship?
body: <p>In the following code:</p>
  
  <pre><code>NSFetchedResultsController *frc =
  [[NSFetchedResultsController alloc]
   initWithFetchRequest:fetchRequest
   managedObjectContext:myManagedObjectContext
   sectionNameKeyPath:@"store"
   cacheName:@"SomeCache"
   ];
  </code></pre>
  
  <p>The @"store" value for sectionNameKeyPath actually points to a relationship to a Store entity which has a name attribute that I really need as my section header title.</p>
  
  <p>But the way my code is setup it cannot be accomplished as I instead get section titles like:
  0x5b504f0 
  0x5b51190 
  Which are code data addresses for the Store object being fetched as far as I can tell.</p>
  
  <p>How can I use NSFetchedResultsController so that I may tell it that I want it to fetch the name attribute of whatever it fetches from sectionNameKeyPath:@"store" ? Or is there some other workaround?</p>