def get_last(postid, limit=10):
        '''
        Get the last one of the records.
        '''
        recs = TabPostHist.select().where(
            TabPostHist.post_id == postid
        ).order_by(TabPostHist.time_update.desc()).limit(limit)
        if recs.count():
            return recs.get()
        return None
Get the last one of the records.