NoReverseMatch 反向“保存后”；带参数 '('',)'未找到。尝试了 1 个模式：['save/(?P[0-9]+)$']

Question

我不明白为什么我总是收到这个“NoReverseMatch at /”。我正在尝试将 AJAX 添加到表单中以保存帖子。这似乎是 Javascript 中 URL 的问题，但我无法弄清楚它到底是什么。谁能告诉我这里出了什么问题吗？先感谢您。

urls.py

path('', PopularPostListView.as_view(), name='popular'),
path('save/<int:pk>', views.AjaxSave, name='save-post'),

views.py

def AjaxSave(request, pk):
    id = int(request.POST.get('postid'))
    post = get_object_or_404(Post, id=id)
    if request.POST.get('action') == 'post':
        result = post.saves.count()
        if post.saves.filter(id=request.user.id).exists():
            post.saves.remove(request.user)
            post.save()
        else:
            post.saves.add(request.user)
            post.save()    

        return JsonResponse({'result': result, })  

#This is the view for the popular page
class PopularPostListView(ListView):
    model = Post
    template_name = 'blog/popular.html'
    context_object_name = 'posts'
    ordering = ['-pinned', '-date_posted']
    paginate_by = 25
    queryset = Post.objects.all().filter(approved=True).order_by('-date_posted', '-pinned')

popular.html

{% extends "blog/base.html" %}
{% block content %}
<h1>Popular Posts</h1>
<div style="margin-left: 10%;">
{% for post in posts %}
<article class="media content-section">
<img class="rounded-circle article-img" src="{{ post.author.profile.image.url }}">
<div class="media-body">
<div class="article-metadata">
<a class="mr-2" href="{% url 'user-posts' post.author.username %}">{{ post.author }}</a>
<small class="date-text">{{ post.date_posted|date:"F d, Y P" }}</small>
</div>
<h3><a class="article-title" href="{% url 'post-detail' post.id %}">{{ post.title }}</a></h3>
<p class="article-content-listview">{{ post.content|urlize }}</p>
<!--Display image-->
{% if post.image %}
<img style="max-width: 100%; max-height: 100%;" src="{{ post.image.url }}">    
   {% else %}
   {{ NONE }}
   {% endif %}
<!--Display video-->
{% if post.video %}
<video style="max-width: 100%; max-height: 100%;" src="{{ post.video.url }}" controls></video>
{% endif %}
<hr>
<!--Dropdown for post options-->
<div class="post_dropdown_home">
<button class="dropbtn"><i class="fa fa-caret-down fa-2x"></i></button>
<div class="post_dropdown_content">
<div>
<!--Displaying save form-->
<form action="{% url 'save-post' post.id %}" id="save" method="post">
{% csrf_token %}
<button class="savebutton" type="submit" name="post_id" title="Save Post" id="save" value="{{ post.id }}">
<i class="fas fa-bookmark"></i> Save Post
</button>
</form>
</div>
<div>
<!--Displaying report button--> 
<form action="{% url 'report_post' post.id %}" method="post">
   {% csrf_token %}
   {% if user != post.author %}
      <button class="reportbutton" type="submit" name="post_id" title="Report Post" value="{{ post.id }}" onclick="reportThank();">
<i class="fas fa-exclamation-circle"></i> Report Post
</button> 
   {% endif %}
</form>
</div>
</div>
</div>
<div>
<!--Showing report count to staff-->
   {% if user.is_staff %}
      <small style="margin-left: 0%;">Reports:</small> {{ post.total_reports }}
   {% endif %}
</div>
</article>
{% endfor %}    
</div>

Javascript

<script>
  $(document).on('click', '#save', function (e){
    e.preventDefault();
    $.ajax({
      type: 'POST',
      url: "{% url 'save-post' post.id %}",
      data: {
        postid: $('#save').val(),
        csrfmiddlewaretoken: $('input[name=csrfmiddlewaretoken]').val(),
        action: 'post'
      },
      success: function (json) {
        alert('Post saved!')
      },
      error: function () {
        alert('Error!')
      }
    });
  })
</script>

修复了views.py

Answer 1

错误来自此行 url: "{% url 'save-post' post.id %}", 此处您无权访问您的 post 对象，因为它不是内部循环，你可以像这样解决你的问题，如果你使用ajax请求，你没有创建表单并设置要提交的按钮类型，像这样更改你的代码

<button class="savebutton" type="button" name="post_id" title="Save Post" id="save" onclick="savePost(event)" value="{{ post.id }}" data-url="{% url 'save-post' post.id %}">
    <i class="fas fa-bookmark"></i> Save Post
</button>

，你的ajax调用将如下所示

<script>
function savePost(event){
var url = event.target.getAttribute("data-url");
$.ajax({
    type: 'POST',
    url: url,
    data: {
        postid: event.target.getAttribute('value'),
        csrfmiddlewaretoken: "{{csrf_token}}",
        action: 'post'
    },
    success: function (json) {
        alert('Post saved!')
    },
    error: function () {
        alert('Error!')
    }
 });
}
</script>

Answer 2

在 Ajaxsave 函数中，您没有指定 pk，您应该将其链接到其中一个对象，然后开始发布帖子，这样视图就无法返回您尝试加载的反向查询，使用 AJAX 请求的最佳实践是使用Django-Rest-Framework 因此它处理所有请求。

def AjaxSave(request, pk):
pk = module.objects.get(pk=pk)
if request.method == "POST":
    # or you can get the pk here if you want without parsing to int
    id = int(request.POST.get('postid'))
    result = post.saves.count()
    post = get_object_or_404(Post, id=id)
    if post.saves.filter(id=request.user.id).exists():
        post.saves.remove(request.user)
        post.save()
    else:
        post.saves.add(request.user)
        post.save()    

    return JsonResponse({'result': result, })