def delete(self, doc):
        if doc.id is None:
            raise DatabaseException('Document does not have id')
        if doc.sid is None:
            try:
                rs = self.db.docs.remove({'id': doc.id}, safe=True)
                assert rs['n'] == 1
            except Exception as e:
                raise DatabaseException(e)
            return None
        doc.data = None
        return self.update(doc)
def _draw_item(self, win, data, inverted):

        if data['type'] == 'MoreComments':
            return self._draw_more_comments(win, data)
        elif data['type'] == 'HiddenComment':
            return self._draw_more_comments(win, data)
        elif data['type'] == 'Comment':
            return self._draw_comment(win, data, inverted)
        else:
            return self._draw_submission(win, data)