如何在Post的DetailView中展示评论与回复表单并解决不显示问题

你的核心问题是没有把评论、回复表单的实例注入到DetailView的上下文里，同时也没在DetailView中处理这两个表单的提交逻辑。下面一步步帮你解决：

1. 改造DetailView，集成表单展示与提交逻辑 #

我们需要在DetailView里同时处理表单渲染和POST请求，重写get_context_data和post方法：

from django.shortcuts import redirect
from django.views.generic import DetailView
from .models import Post, Comment, ReComment
from .forms import CommentCreateForm, ReCommentCreateForm

class PostDetailView(DetailView):
    model = Post
    template_name = 'comment.html'

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        # 把评论表单、回复表单加入上下文，供模板渲染
        context['comment_form'] = CommentCreateForm()
        context['recomment_form'] = ReCommentCreateForm()
        # 传递当前帖子ID，方便表单提交使用
        context['post_pk'] = self.object.pk
        return context

    def post(self, request, *args, **kwargs):
        self.object = self.get_object()
        # 通过提交按钮的name属性区分是评论还是回复请求
        if 'comment_submit' in request.POST:
            # 处理评论提交
            form = CommentCreateForm(request.POST)
            if form.is_valid():
                comment = form.save(commit=False)
                comment.target = self.object
                comment.save()
        elif 'recomment_submit' in request.POST:
            # 处理回复提交，获取对应的评论ID
            form = ReCommentCreateForm(request.POST)
            if form.is_valid():
                comment_pk = request.POST.get('comment_pk')
                target_comment = Comment.objects.get(pk=comment_pk)
                recomment = form.save(commit=False)
                recomment.target = target_comment
                recomment.save()
        # 提交完成后重定向回当前详情页
        return redirect('comment', pk=self.object.pk)

2. 简化URL配置 #

现在不需要单独给CommentCreateView和ReCommentCreateView配置URL了，只保留指向改造后PostDetailView的路由：

urlpatterns = [
    path('comment/<int:pk>/', views.PostDetailView.as_view(), name='comment'),
]

3. 修改模板，渲染两个表单 #

调整comment.html，分别渲染评论表单（页面底部）和每个评论对应的回复表单：

{% load static %}
<html lang="en">
<head>
<meta charset="UTF-8">
<title>COMMENT</title>
</head>
<body>
<div>
<h2>{{ object.text }}</h2>
</div>
<div id="comment-area">
{% for comment in object.comment.all %}
<div class="media m-3">
<div class="media-body">
<h5 class="mt-0">
<span class="badge badge-primary badge-pill">{% by_the_time comment.created_at %}</span>
{{ comment.name }}
<span class="lead text-muted">{{ comment.created_at }}</span>
</h5>
{{ comment.text | linebreaksbr }}

<!-- 每个评论下方的回复表单 -->
<form action="" method="POST" enctype='multipart/form-data' class="mt-2">
    {% for field in recomment_form %}
    {% if field.name != 'target' %} <!-- 隐藏自动关联的target字段 -->
    <div class="form-group">
        {{ field.errors }}
        <label for="{{ field.id_for_label }}">{{ field.label }}</label>
        {{ field }}
    </div>
    {% endif %}
    {% endfor %}
    <!-- 隐藏字段：传递当前要回复的评论ID -->
    <input type="hidden" name="comment_pk" value="{{ comment.pk }}">
    {% csrf_token %}
    <input class="btn btn-secondary btn-sm" type="submit" name="recomment_submit" value="Reply">
</form>

{% for recomment in comment.recomment.all %}
<div class="media m-3">
<div class="media-body">
<h5 class="mt-0">
{{ recomment.name }}
<span class="lead text-muted">{{ recomment.created_at }}</span>
</h5>
{{ recomment.text | linebreaksbr }}
</div>
</div>
{% endfor %}
</div>
</div>
{% endfor %}
</div>

<!-- 页面底部的评论表单 -->
<form action="" method="POST" enctype='multipart/form-data' class="mt-4">
{% for field in comment_form %}
<div class="form-group">
    {{ field.errors }}
    <label for="{{ field.id_for_label }}">{{ field.label }}</label>
    {{ field }}
</div>
{% endfor %}
{% csrf_token %}
<input class="btn btn-primary" type="submit" name="comment_submit" value="Comment">
</form>
</body>
</html>

关键细节提示 #

• 用提交按钮的name属性（comment_submit/recomment_submit）区分两种提交请求，让DetailView能正确处理不同表单。
• 回复表单通过隐藏字段comment_pk传递目标评论ID，后台据此关联回复与评论。
• 模板中表单变量名（comment_form/recomment_form）必须和DetailView上下文里的变量名完全对应。

现在访问http://localhost:8000/polls/comment/1/就能看到正常显示的评论和回复表单，提交后也会正确保存并刷新页面。

内容的提问来源于stack exchange，提问作者user9179850