Django问题：无法将评论关联至特定Product对象

评论能成功存入数据库，但无法关联到对应的商品，不清楚如何通过slug将评论和特定Product对象绑定。

相关代码 #

views.py #

class ProductDetail(DetailView):
    model = Product
    template_name = 'store/product-single.html'
    context_object_name = 'product'


    def get_context_data(self, **kwargs):
        context = super().get_context_data()
        products = Product.objects.all()[:4]
        context['products'] = products
        product = Product.objects.get(slug=self.kwargs['slug'])
        context['title'] = product.title
        context['comment_form'] = CommentForm()
        context['comments'] = Comment.objects.all()
        return context

def save_comment(request):
    form = CommentForm(request.POST)
    if form.is_valid():
        comment = form.save(commit=False)
        # comment.product = Product.objects.filter()
        comment.save()
        return redirect('index')

urls.py #

path('save_comment/', save_comment, name='save_comment')

product-single.html #

<div class="container">
  <form action="{% url 'save_comment' %}" method="POST">
    {% csrf_token %}
    {{ comment_form.as_p }}

    <button type="submit" class="btn btn-primary  btn-lg">Submit</button>
  </form>
</div>

models.py #

class Comment(models.Model):
    product = models.ForeignKey(Product, on_delete=models.CASCADE, null=True)
    user = models.CharField(default='', max_length=255)
    text = models.TextField(default='')

forms.py #

class CommentForm(forms.ModelForm):
    class Meta:
        model = Comment
        fields = ['user', 'text']
        widgets = {
            'user': forms.TextInput(),
            'text': forms.Textarea()
        }

核心问题是提交评论时没传递当前商品的slug，导致无法关联对应Product对象，按以下步骤修改：

• 在表单中添加商品slug隐藏字段
  修改product-single.html，把当前商品的slug通过隐藏字段传给后端：

  <div class="container">
    <form action="{% url 'save_comment' %}" method="POST">
      {% csrf_token %}
      {{ comment_form.as_p }}
      <!-- 新增隐藏字段传递商品slug -->
      <input type="hidden" name="product_slug" value="{{ product.slug }}">
      <button type="submit" class="btn btn-primary  btn-lg">Submit</button>
    </form>
  </div>
  

• 修改save_comment视图绑定商品
  更新views.py里的save_comment函数，从POST请求中取slug，查询对应商品并绑定到评论：

  def save_comment(request):
      form = CommentForm(request.POST)
      if form.is_valid():
          comment = form.save(commit=False)
          # 从POST获取slug，查询对应商品
          product_slug = request.POST.get('product_slug')
          comment.product = Product.objects.get(slug=product_slug)
          comment.save()
          # 建议提交后跳回商品详情页，而非首页
          return redirect('product_detail', slug=product_slug)
      # 表单验证失败时返回原页面
      return redirect(request.META.get('HTTP_REFERER', 'index'))
  

• 优化商品详情页的评论展示（可选）
  当前视图会显示所有评论，改成只展示当前商品的评论更合理：

  def get_context_data(self, **kwargs):
      context = super().get_context_data()
      products = Product.objects.all()[:4]
      context['products'] = products
      product = self.get_object()  # 用DetailView自带方法获取当前商品，无需重复查slug
      context['title'] = product.title
      context['comment_form'] = CommentForm()
      # 只查询当前商品的评论
      context['comments'] = Comment.objects.filter(product=product)
      return context
  

内容的提问来源于stack exchange，提问作者Shaxriyor