十进制字段形式的变量min_value

如何解决十进制字段形式的变量min_value

我正在尝试设置字段的表单变量的最小值。

class BidForm(forms.ModelForm):
    
    def __init__(self,*args,**kwargs):
        super().__init__(*args,**kwargs)
        self.fields['bid'] = forms.DecimalField(min_value=50,error_messages={'min_value': 'Price must be greater than the current price'}) 
        self.fields['bid'].widget.attrs.update({'placeholder': 'Place your bid here','step': 1})

在这种情况下，我已经将50值编码了，但是我需要根据当前出价进行设置。

这是“出价”，“用户”和“拍卖”模型：

class User(AbstractUser):
    pass

class Auction(models.Model):
    title = models.CharField(max_length=64)
    description = models.TextField()
    base_price = models.DecimalField(max_digits=5,decimal_places=2)
    image = models.CharField(max_length=120,blank=True)
    category = models.ForeignKey(Category,default=2,on_delete=models.CASCADE)
    user = models.ForeignKey(User,related_name="auctions",on_delete=models.CASCADE)
    is_active = models.BooleanField(default=True)
    slug = models.SlugField(max_length=100)
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)

    def get_absolute_url(self):
        return reverse("detail",args=[self.slug])

class Bid(models.Model):
    bid = models.DecimalField(max_digits=5,decimal_places=2)
    user = models.ForeignKey(User,related_name="bid",on_delete=models.CASCADE)
    auction = models.ForeignKey(Auction,on_delete=models.CASCADE)

    def __str__(self):
        return f'Bid for ${self.bid} on {self.auction} by {self.user}'

这是视图：

def detail(request,auction):
    auction = get_object_or_404(Auction,slug=auction)
    comments = auction.comments.all()
    current_bid = auction.bid.last()

    comment_message = None
    bid_message = None
    new_comment = None
    new_bid = None

    if request.method == 'POST':
        comment_form = CommentForm(data=request.POST)
        bid_form = BidForm(data=request.POST)
        if request.POST.get("form_type") == 'form_comment':
            bid_form = BidForm()
            if not request.user.is_authenticated:
                comment_message = "You have to sign in to post a comment"
            else:
                if comment_form.is_valid():
                    new_comment = comment_form.save(commit=False)
                    new_comment.auction = auction
                    new_comment.user = request.user
                    new_comment.save()
                    return redirect('detail',auction.slug)
        elif request.POST.get("form_type") == 'form_bid':
            comment_form = CommentForm()
            if not request.user.is_authenticated:
                bid_message = "You have to sign in to place a bid"
            else:
                if bid_form.is_valid():
                    new_bid = bid_form.save(commit=False)
                    new_bid.auction = auction
                    new_bid.user = request.user
                    print(bid_form)
                    new_bid.save()
                    return redirect('detail',auction.slug)
    else: 
        comment_form = CommentForm()
        bid_form = BidForm()

    context = {'auction': auction,'comments': comments,'comment_form': comment_form,'bid_form': bid_form,'new_comment': new_comment,'new_bid': new_bid,'current_bid': current_bid,'comment_message': comment_message,'bid_message': bid_message
               }
               
    return render(request,'auctions/detail.html',context)

表格中的模板：

<form action="" method="post" novalidate>
            {% csrf_token %}
            <input type="hidden" name="form_type" value="form_bid">
                <div class="msg">
                    <div class="input-group">
                        {{bid_form.bid}}
                        {% comment %} 
                                <input type="number" id="id_bid" name="bid" 
                                min="{{current_bid.bid|add:1}}"> 
                        {% endcomment %}
                        {% if bid_form.bid.errors %}
                            {{bid_form.bid.errors}}
                        {% endif %} 
                    </div>
                </div>
                <div class="input-group send-reset">
                    <input type="submit" value="Place Bid"/>
                </div>
            </form>

{{bid_form.bid}}呈现为 <input type="number" name="bid" min="50" step="1" placeholder="Place your bid here" required> 但我需要将其渲染为

<input type="number" id="id_bid" name="bid" min="{{current_bid.bid|add:1}}"> 

最后一个在客户端运行，但是我无法在服务器端实现它。 任何帮助，将不胜感激！！ 预先感谢