title: NSPredicate on NSFetchedResultsController fetchedObjects
body: <p>I have a <code>fetchedResultsController</code> which is pulling back a number of <code>User</code> objects. </p>
  
  <p>I have a one to many relationship with my <code>User</code> object, one <code>User</code> to many <code>Site</code> objects called <code>sitesToUser</code>.</p>
  
  <p>I am trying to filter my <code>[fetchedResultsController fetchedObjects]</code> quickly, doing:</p>
  
  <pre><code>NSPredicate *pred = [NSPredicate predicateWithFormat:@"sitesToUser.isActive == 0"];
  NSArray *filt = [[self.fetchedResultsController fetchedObjects] filteredArrayUsingPredicate:pred];
  </code></pre>
  
  <p>However, the <code>filt</code> array never returns any results. It doesn't seem to matter which Entity attribute I use, it never returns any results in 'filt'. </p>
  
  <p>In the above, <code>isActive</code> is a <code>BOOL</code> saved as an <code>NSNumber</code>. Any ideas....?</p>