title: Does NSFetchedResultController ignores changes in some cases?
body: <p>In my current app I am currently using MagicalRecord for importing data from a REST API with a UITableView implementing a NSFetchedResultController. </p>
  
  <p>The case where the problem occurs: </p>
  
  <ol>
  <li>I setup a NSFetchedResultController with the predicate as following: [NSPredicate predicateWithFormat:@"friend_type != %i", FacebookFriend];</li>
  <li>First I retrieve friends from Facebook which get the friend_type FacebookFriend (from enum).</li>
  <li>I will try to resolve their Facebook ID's with a REST API call.</li>
  <li>If users were resolved I will change their friend_type to ResolvedFacebookFriend (from enum)</li>
  <li>The NSFetchedResultController wont be notified with these changes.</li>
  </ol>
  
  <p>See the following code for initializing my NSFetchedResultController and importing from the data sources.</p>
  
  <p>Creating a NSFetchedResultController via the MagicalRecord library</p>
  
  <pre><code>NSPredicate* predicate = [NSPredicate predicateWithFormat:@"friend_type != %i", FacebookFriend];
  self.friendsResultController = [Friend fetchAllGroupedBy:@"friend_type" withPredicate:predicate sortedBy:@"friend_type,user.nickname" ascending:YES delegate:self];
  </code></pre>
  
  <p>Creating the Friend entity via the MagicalRecord library after the first API call was made to Facebook:</p>
  
  <pre><code>Friend* userFriend = [Friend createEntity];
  userFriend.friend_type = [NSNumber numberWithInteger:FacebookFriend];
  </code></pre>
  
  <p>Updating these FacebookFriends if they were resolved by my local REST API:</p>
  
  <pre><code>Friend* userFriend = [Friend ....] // Correct friend was fetched
  userFriend.friend_type = [NSNumber numberWithInteger:ResolvedFacebookFriend];
  </code></pre>
  
  <p>What could i do to make the NSFetchedResultController be notified by these changes? If not is this a bug of Apple or should I setup my CoreData in a different way?</p>
  
  <p><strong>Edit - 14 November 2013</strong></p>
  
  <p>I found out when the object is saved with the friend_type ResolvedFacebookFriend. And saving it again like this:</p>
  
  <pre><code>userFriend.friend_type = userFriend.friend_type;
  // Save the context again
  </code></pre>
  
  <p>The NSFetchedResultController sees the change all of a sudden and inserts a row into the UITableView.</p>