'Adds the activities to the notification feed and marks them as unread/unseen.'

def add_many_aggregated(self, aggregated, *args, **kwargs):

    super(BaseNotificationFeed, self).add_many_aggregated(aggregated, *args, **kwargs)
    ids = [a.serialization_id for a in aggregated]
    self.update_markers(ids, ids, operation='add')
