title: NSManagedObjectContextDidSaveNotification not triggered in iOS 7
body: <p>I have a situation where I make some changes to the properties of a NSManagedObject in main thread. It belongs to the main ManagedObjectContext of the app.</p>
  
  <p>My app does has threading enabled which downloads data, each thread has it's own ManagedObjectContext created from the most recent state of a single PersistentStore throughout the application.</p>
  
  <p>I am implementing <code>NSManagedObjectContextDidSaveNotification</code> so that any changes in the MOC is merged back to the main thread's MOC too. Below is the code for it:</p>
  
  <pre><code>- (void)backgroundMOCDidSave:(NSNotification*)notification
  {
      // Probable fix for: http://stackoverflow.com/questions/3446983/collection-was-mutated-while-being-enumerated-on-executefetchrequest
      if (![NSThread isMainThread])
      {
          [self performSelectorOnMainThread:@selector(backgroundMOCDidSave:) withObject:notification waitUntilDone:YES];
          return;
      }
  
      // We merge the background moc changes in the main moc
      [self.managedObjectContext mergeChangesFromContextDidSaveNotification:notification];
  }
  </code></pre>
  
  <p>Registering for this notification:</p>
  
  <pre><code>        [[NSNotificationCenter defaultCenter] addObserver:self
                                                   selector:@selector(backgroundMOCDidSave:)
                                                       name:NSManagedObjectContextDidSaveNotification
                                                     object:nil];
  </code></pre>
  
  <p>Strange things happen in iOS 7 though. I am accessing a NSManagedObject which is created from the main MOC:</p>
  
  <ul>
  <li>When I modify a property of the ManagedObject which belongs to main MOC (main thread) and perform a <code>-save</code> the <code>-backgroundMOCDidSave:</code> call is not triggered</li>
  <li>When I do not modify any property of the ManagedObject and just perform a <code>-save</code> operation on its MOC the notification is triggered</li>
  </ul>
  
  <p>The same code is working perfectly well in iOS 6. Irrespective of whether any changes is done on the ManagedObject or not, when a <code>-save</code> call is triggered on it's MOC the notification <code>NSManagedObjectContextDidSaveNotification</code> gets triggered.</p>
  
  <p>Anyone faced this problem before?</p>