code: def get_app_content_types(self):
          
          # Import this here to silence RemovedInDjango19Warning. See #15
          from django.contrib.contenttypes.models import ContentType
  
          return [ContentType.objects.get_for_model(c) for c
                  in self.get_app_model_classes()]
docs: Return a list of all content_types for this app.