Django模型中是否有任何字段，用户没有填充，但是计算机可以填写？ （CS50项目2）

Question

我创建了一个Django表单，该表格可为列表创建并保存评论。我希望该评论仅保存到对其进行评论的列表中（现在它保存到所有列表中）。有什么方法可以告诉网页要将其保存到哪个列表以及哪个用户写了评论？

Models.py

class Comments(models.Model):
    comment = models.CharField(max_length=500)

Views.py

@login_required(login_url='login')
def listing(request, id):
    listing = Listings.objects.get(id=id)
    form = CommentForm
    if request.method == "POST":
        form = CommentForm(request.POST)
        if form.is_valid():
            comment = form.save()
            comment.save()
        else:
            return render(request, "auctions/listing.html",{
               "auction_listing": listing,
               "form": form,
               "comments": Comments.objects.all() 
               })
    return render(request, "auctions/listing.html",{
        "auction_listing": listing,
        "form": form,
        "comments": Comments.objects.all()
    })

HTML

<img src ="{{ auction_listing.image }}" style = "height: 10%; width: 10%;">
    <h4 class = "text">{{ auction_listing.title }}</h4>
    <h6>Description: {{ auction_listing.description }}</h6>
    <h6>Category: {{ auction_listing.category }}</h6> 
    <h6>Price: ${{ auction_listing.bid }}</h6>

    <form action = "{% url 'listing' auction_listing.id %}" method = "POST">
        {% csrf_token %}
        {{ form }}
        <input type = "submit" value = "Save">
    </form>

    {% for comment in comments %}
        <h6> {{ comment.comment }} </h6>
    {% endfor %}

感谢您的所有帮助！

这是我现在尝试保存新评论时收到的错误。让我知道您是否需要查看评论表格。

IntegrityError at /listing/1/
NOT NULL constraint failed: auctions_comments.listing_id
Request Method: POST
Request URL:    http://127.0.0.1:8000/listing/1/
Django Version: 3.2.5
Exception Type: IntegrityError
Exception Value:    
NOT NULL constraint failed: auctions_comments.listing_id

Answer 1

我希望该评论仅保存到列表中，该列表将其评论给 - ，以便将评论保存到当前或特定的清单中，您可以在评论和评论之间创建关系清单。

更新您的评论模型

class Comments(models.Model):
    listing = models.ForeignKey(Listings, on_delete=models.CASCADE) # for one-to-many relation
    comment = models.CharField(max_length=500)

，并在保存您的表格通过列表对象时，并在使用当前列表进行过滤时，

@login_required(login_url='login')
def listing(request, id):
    listing = Listings.objects.get(id=id)
    comment_obj = Comments.objects.filter(listing=listing) 
    form = CommentForm() # you have to initialize form properly
    if request.method == "POST":
        form = CommentForm(request.POST)
        if form.is_valid():
            comment = form.save(commit=False)
            comment.listing = listing
            comment.save()
        else:
            return render(request, "auctions/listing.html",{
               "auction_listing": listing,
               "form": form,
               "comments": comment_obj
               })
    return render(request, "auctions/listing.html",{
        "auction_listing": listing,
        "form": form,
        "comments": comment_obj
    })

我建议您查看 foreferkey.related_name_name