刪除討論主題

新增路徑規則

開啟 forum/topic/urls.py ，新增第 9 行規則：

urlpatterns = [
    path('', TopicList.as_view(), name='topic_list'),
    path('new/', TopicNew.as_view(), name='topic_new'), 
    path('<int:pk>/', TopicView.as_view(), name='topic_view'),
    path('<int:tid>/reply/', TopicReply.as_view(), name='topic_reply'),
    path('<int:tid>/delete/', TopicDelete.as_view(), name='topic_delete'),
]

新增處理視圖

開啟 forum/topic/views.py，增加以下程式碼：

from django.contrib.auth.mixins import PermissionRequiredMixin

# 刪除討論主題
class TopicDelete(PermissionRequiredMixin, DeleteView):
    permission_required = 'topic.delete_topic'
    model = Topic
    template_name = 'confirm_delete.html'

    def get_success_url(self):
        return reverse('topic_list')

新增頁面範本

新增刪除頁面範本檔案 forum/pagetmpl/confirm_delete.html：

{% extends "base.html" %}

{% block content %}
<h1>刪除記錄</h1>
<p class="alert alert-danger">
  您確定要刪除這筆記錄嗎? <br/>
  {{ object }}
</p>
<form action="" method="POST">
  {% csrf_token %}
  <input type="submit" class="btn btn-danger" value="是的，我要刪除" />
</form>
{% endblock %}

更新主題檢視範本

修改 forum/pagetmpl/topic/topic_detail.html：

{% extends "base.html" %}

{% block content %} 
<div class="card">
  <div class="card-header d-md-flex justify-content-between">
    <div class="h3">{{ topic.subject }}</div>
    <div class="text-muted">
      <small><i class="fas fa-user"></i> {{ topic.author }}</small>
      <small><i class="fas fa-clock"></i> {{ topic.created|date:"Y/m/d H:i" }}</small>
    </div>
  </div>
  <div class="card-body">
    {% if perms.topic.delete_topic %}
    <a href="{% url 'topic_delete' topic.id %}" class="btn btn-sm btn-danger float-right">刪除主題</a>
    {% endif %}
    {{ topic.content|linebreaks }}
  </div>
  {% if user.is_authenticated %}
  <div class="card-footer">
    <a href="{% url 'topic_reply' topic.id %}" class="btn btn-primary">回覆討論</a>
  </div>
  {% endif %}
</div>
<hr/>
<ul class="list-group">
  {% for reply in reply_list %}
  <li class="list-group-item d-md-flex justify-content-between">
    <div class="ml-2">{{ reply.content|linebreaks }}</div>
    <small class="text-muted">
      <i class="fas fa-user"></i> {{ reply.author }}
      <i class="fas fa-clock"></i> {{ reply.created|date:"Y/m/d H:i" }}
    </small>
  </li>
  {% endfor %}
</ul>
{% endblock %}

刪除回覆意見

開啟 forum/topic/urls.py，增加第 10 行路徑規則：

urlpatterns = [
    path('', TopicList.as_view(), name='topic_list'),
    path('new/', TopicNew.as_view(), name='topic_new'), 
    path('<int:pk>/', TopicView.as_view(), name='topic_view'),
    path('<int:tid>/reply/', TopicReply.as_view(), name='topic_reply'),
    path('<int:pk>/delete/', TopicDelete.as_view(), name='topic_delete'),
    path('reply/<int:pk>/delete/', ReplyDelete.as_view(), name='reply_delete'),
]

開啟 forum/topic/views.py，增加以下視圖類別來處理刪除回覆的請求：

# 刪除討論回覆
class ReplyDelete(PermissionRequiredMixin, DeleteView):
    permission_required = 'topic.delete_reply'
    model = Reply
    template_name = 'confirm_delete.html'

    def get_success_url(self):
        reply = self.get_object()   # 取得欲刪除的那筆紀錄
        return reverse('topic_view', args=[reply.topic.id])

• 第 69 行，在 DeleteView 的衍生類別裡可透過其 get_object() 方法來取得欲刪除的那筆紀錄

更新檢視討論主題頁面範本

開啟 forum/pagetmpl/topic/topic_detail.html，修改為以下程式碼：

{% extends "base.html" %}

{% block content %} 
<div class="card">
  <div class="card-header d-md-flex justify-content-between">
    <div class="h3">{{ topic.subject }}</div>
    <div class="text-muted">
      <small><i class="fas fa-user"></i> {{ topic.author }}</small>
      <small><i class="fas fa-clock"></i> {{ topic.created|date:"Y/m/d H:i" }}</small>
    </div>
  </div>
  <div class="card-body">
    {% if perms.topic.delete_topic %}
    <a href="{% url 'topic_delete' topic.id %}" class="btn btn-sm btn-danger float-right">刪除主題</a>
    {% endif %}
    {{ topic.content|linebreaks }}
  </div>
  {% if user.is_authenticated %}
  <div class="card-footer">
    <a href="{% url 'topic_reply' topic.id %}" class="btn btn-primary">回覆討論</a>
  </div>
  {% endif %}
</div>
<hr/>
<ul class="list-group">
  {% for reply in reply_list %}
  <li class="list-group-item d-md-flex justify-content-between">
    <div class="ml-2">{{ reply.content|linebreaks }}</div>
    <small class="text-muted">
      <i class="fas fa-user"></i> {{ reply.author }}
      <i class="fas fa-clock"></i> {{ reply.created|date:"Y/m/d H:i" }}
      {% if perms.topic.delete_reply %}
      <a href="{% url 'reply_delete' reply.id %}" class="btn btn-sm btn-danger">刪除回覆</a>
      {% endif %}
    </small>
  </li>
  {% endfor %}
</ul>
{% endblock %}