Question

我正在建立一个拍卖网站，我希望清单上的最高出价为> = start_price，然后如果用户尝试输入bid_input

我认为我可能已经解决了如何使用clean（self）来验证bid_input的方法，但是我不确定如何将maximum_bid默认值设置为大于或等于start_price。保存时应该在模型上还是在表单上完成？我对如何真正做到这一点感到很困惑。

models.py

class Listing(models.Model):

    class NewManager(models.Manager):
        def get_queryset(self):
            return super().get_queryset().filter(status='active')

    options = (
        ('active', 'Active'),
        ('closed', 'Closed'),
    )

    title = models.CharField(max_length=64)
    description = models.TextField(max_length=64)
    start_price = models.DecimalField(max_digits=9, decimal_places=2, validators=[MinValueValidator(0.99)])
    image = models.URLField(max_length=200, blank=True)
    category = models.ForeignKey(Category, on_delete=models.CASCADE, related_name="listings")
    lister = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, default=None, null=True, blank=True)
    date_added = models.DateTimeField(default=timezone.now)
    highest_bid = models.DecimalField(max_digits=9, decimal_places=2, default=None)
    status = models.CharField(max_length=10, choices=options, default="active")
    favourites = models.ManyToManyField(User, related_name="favourite", default=None, blank=True)
    objects = models.Manager()
    listingmanager = NewManager()

    def __str__(self): 
        return f"{self.title} ({self.pk}, £{self.start_price}, {self.lister})"


class Bid(models.Model):
    bidder_user = models.ForeignKey(User, on_delete=models.CASCADE, related_name="bidders")
    bid_item = models.ManyToManyField(Listing, related_name="bid_items", default=None)
    bid_input = models.DecimalField(max_digits=9, decimal_places=2, default=None)
    time= models.DateTimeField(default=timezone.now)

    def __str__(self):
        return f"Bid amount: {self.bid_input}"

forms.py

class NewListingForm(forms.ModelForm):
    class Meta:
        model = Listing
        fields = ["title", "description", "start_price", "image", "category", "highest_bid"]

    title = forms.CharField(widget=forms.TextInput(attrs={'autocomplete':'off'}))
    description = forms.CharField(widget=forms.TextInput(attrs={'autocomplete':'off'}))
    start_price = forms.DecimalField(label='Starting Bid Price (£)')
    image = forms.URLField(widget=forms.URLInput(attrs={'autocomplete':'off'}))
    highest_bid = forms.DecimalField(required=False, widget=forms.HiddenInput())

class BidForm(forms.ModelForm):
    class Meta:
        model = Bid
        fields = ["bid_input"]
        labels = {"bid_input": ""}
        widgets = {
            "bid_input": forms.NumberInput(attrs={'placeholder': 'Enter bid (£)'})
        }

相对于其他字段设置模型默认值

0 个答案: