我正在使用 Django createview 在拍賣網站中創建投標項目。createview 將創建新對象，但它會創建一個沒有相應外鍵的額外對象實例。我正在使用 @staticmethod 來確定提交的出價是否確實是最高出價，然后在相關列表中創建。如果您能指出我做錯了什么，請提前致謝。models.pyclass Bid(TimeStampMixin):    """model representing bid obj"""    auction = models.ForeignKey(        Listing,         on_delete=models.SET_NULL,         related_name='offer',         null=True)    bidder = models.ForeignKey(        settings.AUTH_USER_MODEL,         on_delete=models.SET_NULL,         null=True,        related_name='bid_user')    amount = models.PositiveIntegerField()    objects = BidQuerySet.as_manager()            def __str__(self):        return f"{self.amount} in Listing No: {self.auction.id}"    class Meta:        ordering = ['amount']    @staticmethod    def high_bid(auction, bidder, bid_amount):        """util method to ascertain highest bid in auction then create in related auction obj        :param auction---listing being bid on, bid__auction        :param bidder---user bidding        :param amount--- current highest bid        """        ###error checks, is auction running? is current bid less than start bid? etc        if bid_amount < auction.start_bid:            return        if (auction.highest_offer and bid_amount < auction.highest_offer.amount):            return        if bidder.id is auction.user.id:            raise PermissionDenied        ##after checks create highest bid object in listing model        new_high_bid = Bid.objects.create(            auction= auction,            bidder = bidder,            amount = bid_amount        )