class CommissionRecord(models.Model):
user = models.ForeignKey(User)
no = models.CharField(max_length=100)
add_time = models.DateTimeField(auto_now_add=True)
desc = models.CharField(max_length=100)
amount = models.IntegerField()
bid = models.ForeignKey(Bid)
如何根据该表取出今天的记录，本周的记录，本月的记录，踩了好多坑啊，感觉都不行，datetime.date.today()也不行。
