如何在 ListView Django 中添加評論表單？

Question

進入：我在 listviewpage 中有一個包含多個帖子的查詢集。 我想在listviewpage而不是detailpageview中為每個帖子添加評論表單。 我還在帖子列表的 forloop 中包含 html 表格

問題：下面的代碼出現錯誤'ValidationError' object has no attribute 'get'

如果有任何幫助，我將不勝感激。

模型.py

class Comment(models.Model):
  
    user = models.ForeignKey(User, on_delete=models.CASCADE, null=True)
    post = models.ForeignKey(Post, on_delete=models.CASCADE, null=True, blank=True)
    comments = models.TextField(max_length=1000, blank=True)
    created_at = models.DateTimeField(auto_now_add=True)

視圖.py

def ListViewPage(request):
    queryset = Post.objects.all()
    comment = CommentForm(data=request.POST)
    if request.method == 'POST':
        try:
            pk = request.POST.get('pk')
            post = Post.objects.get(id=pk)
        except Post.DoesNotExist:
            return ValidationError(f'No Post by id {pk}')


        if comment.is_valid():
            com = comment.save(commit=False)
            com.posts = post
            com.save()

    context = {
        'posts': queryset,
        'form': comment
    }
    return render(request, 'post_list.html', context)

post_list.html

{% for object in sales %}
<div class="hpanel hblue">
    <div class="row">
        <div class="col-sm-3">
            <div class="project-label">Saler</div>
            <small>{{ object.user }}</small>
        </div>
        <div class="col-sm-4">
            <div class="project-label">Timestamp</div>
            <small>{{ object.created_on|naturalday }}</small>
        </div>
        <div class="col-sm-4">
            <div class="project-label">Product</div>
            <small>{{ object.created_on|naturalday }}</small>
        </div>
    </div>
    <form action="." method="POST"> {% csrf_token %}

        <div class="form-group">
            <textarea name="comments" id="id_comments" cols="30" rows="2" required class="form-control"
                placeholder="comments..."></textarea>
        </div>
        <button type="submit" class="btn btn-sm btn-default">submit</button>
    </form>
</div>
{% endfor %}

Answer 1

您不能在視圖中返回 aq ValidationError ，您需要返回 HTTP 響應，或者引發Http404異常，例如：

from django.http import Http404
from django.shortcuts import redirect

def ListViewPage(request):
    queryset = Post.objects.all()
    if request.method == 'POST':
        try:
            pk = request.POST.get('pk')
            post = Post.objects.get(id=pk)
        except Post.DoesNotExist:
            raise Http404(f'No Post by id {pk}')
        comment_form = CommentForm(data=request.POST)
        if comment_form.is_valid():
            comment_form.instance.posts = post
            comment_form.save()
            return redirect('')
    else:
        comment_form = CommentForm()
    context = {
        'posts': queryset,
        'form': comment_form
    }
    return render(request, 'post_list.html', context)

---

注意：如果 POST 請求成功，您應該進行redirect [Django-doc]以實現Post/Redirect/Get模式 [wiki] 。 這樣可以避免在用戶刷新瀏覽器時發出相同的 POST 請求。