我的 vews.py：
如果您想讓我分享另一條資訊，請隨時詢問！我只是出價系統有問題！！，我嘗試了出價，但是當我將新號碼添加到輸入欄位并單擊“出價”按鈕時，頁面會重新加載，這意味著該功能不起作用！！當我嘗試關閉出價時，我遇到了另一個問題，我 git 這個 Django 錯誤
ValueError at /bidding/26
The view auctions.views.bidding didn't return an HttpResponse object.
It returned None instead.
編碼：
def viewList(request, id):
# check for the watchlist
listing = Post.objects.get(id=id)
user = User.objects.get(username=request.user)
if listing.watchers.filter(id=request.user.id).exists():
is_watched = True
else:
is_watched = False
if not listing.activate:
if request.POST.get('button') == "Close":
listing.activate = True
listing.save()
else:
price = request.POST.get('bid', 0)
bids = listing.bids.all()
if user.username != listing.creator.username:
if price <= listing.price:
return render(request, 'auctions/item.html', {
"listing": listing,
'form': BidForm(),
"message": "Error! Your bid must be largest than the current bid!",
'comment_form': CommentForm(),
'comments': listing.get_comments.all(),
'is_watched': is_watched,
})
form = BidForm(request.POST)
if form.is_valid():
bid = form.save(commit=False)
bid.user = user
bid.save()
listing.bids.add(bid)
listing.bid = price
listing.save()
else:
return render(request, 'acutions/item.html', {'form'})
context = {
'listing': listing,
'comment_form': CommentForm(),
'comments': listing.get_comments.all(),
'is_watched': is_watched,
'form': BidForm()}
return render(request, 'auctions/item.html', context)
模型.py
class Bid(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE)
bid = models.DecimalField(max_digits=10, decimal_places=2)
time = models.DateTimeField(default=timezone.now)
class Post(models.Model):
# data fields
title = models.CharField(max_length=64)
textarea = models.TextField()
# bid
price = models.FloatField(default=0)
currentBid = models.FloatField(blank=True, null=True)
imageurl = models.CharField(max_length=255, null=True, blank=True)
category = models.ForeignKey(
Category, on_delete=models.CASCADE, default="No Category Yet!", null=True, blank=True)
creator = models.ForeignKey(
User, on_delete=models.PROTECT, related_name="all_creators_listings")
watchers = models.ManyToManyField(
User, blank=True, related_name='favorite')
date = models.DateTimeField(auto_now_add=True)
# for activated the Category
activate = models.BooleanField(default=False)
bids = models.ManyToManyField(Bid, )
def __str__(self):
return f"{self.title} | {self.textarea} | {self.date.strftime('%B %d %Y')}"
專案.html
<div class="card-body">
<ul class="list-group">
<div class="info">
<li class="list-group-item mb-2">Description:<br>{{listing.textarea}}</li>
<li class="list-group-item mb-2">category: {{listing.category.name}}</li>
<li class="list-group-item mb-2"><h5>Start bid: {{listing.price}}$</h5></li>
</div>
<div class="newbid">
<p>{{ message }}</p>
<form action="{% url 'viewList' listing.id %}" method="POST">
{% csrf_token %}
<div class="form-group">
<label for="bid">{{ listing.bids.count }} bid(s) so far. Your bid is the current bid</label>
</div>
<div class="form-group">
{{ form }}
</div>
<div class="form-group">
<input type="submit" name="button" class="btn btn-primary" value="Place Bid">
</div>
</form>
{% if listing.activate %}
<li><strong>Winner: </strong>{{ listing.bids.last.user.username }}</li>
{% endif %}
{% if user.username == listing.creator.username and not listing.activate %}
<form action="{% url 'viewList' listing.id %}" method="POST">
{% csrf_token %}
<button type="submit" name="button" class="btn btn-danger" value="Close">Close</button>
</form>
{% endif %}
</div>
</ul>
</div>
在這個視圖中，我添加了我的專案要求（評論/監視串列（書簽）/最后一件事（我有很多問題）是投標系統），它允許用戶在此類帖子上添加投標并讓該帖子的創建者能夠關閉它......請幫助我堅持這個區域，我嘗試了很多次才能理解！ 注意我是后端開發的新手！
uj5u.com熱心網友回復：
你的代碼有兩個問題，第一個是 Husam 強調的
user = User.objects.get(username=request.user.username)
，另一個是在 else 部分的 return 陳述句中
render(request, 'acutions/item.html', {'form'})您傳遞的字串不是背景關系物件，而是set在 python 中被視為物件的字串，這就是您收到None type錯誤的原因。
這是重構的代碼：-
def viewList(request, id):
# check for the watchlist
listing = Post.objects.get(id=id)
user = User.objects.get(username=request.user.username)
form = BidForm()
is_watched = listing.watchers.filter(id=request.user.id).exists():
context = {}
if not listing.activate:
if request.POST.get('button') == "Close":
listing.activate = True
listing.save()
else:
price = request.POST.get('bid', 0)
bids = listing.bids.all()
if user.username != listing.creator.username:
if price <= listing.price:
context.update({'message':"Error! your bid must be largest than the current bid !"})
else:
form = BidForm(request.POST)
if form.is_valid():
bid = form.save(commit=False)
bid.user = user
bid.save()
listing.bids.add(bid)
listing.bid = price
listing.save()
else:
return render(request, 'acutions/item.html', {'form': form})
context.update({'listing': listing,
'comment_form': CommentForm(),
'comments': listing.get_comments.all(),
'is_watched': is_watched,
'form': form})
return render(request, 'auctions/item.html', context)
uj5u.com熱心網友回復：
您在出價視圖中遇到的錯誤和您共享的視圖是視圖串列，如果您共享出價視圖并突出顯示錯誤行會更好
無論如何，我注意到這一行有一個錯誤： user = User.objects.get(username=request.user)
假設是： user = User.objects.get(username=request.user.username)
希望這可以幫助你一點點
轉載請註明出處，本文鏈接：https://www.uj5u.com/qianduan/351589.html
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