NoReverseMatch at / 实现注释选项时出错

Posted 2023-02-24

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【中文标题】NoReverseMatch at / 实现注释选项时出错【英文标题】：NoReverseMatch at / error when implementing a comment option 【发布时间】：2021-06-13 05:29:35 【问题描述】：

我正在尝试为 django 社交媒体应用程序实现评论选项，但在 / 错误时出现 NoReverseMatch。

NoReverseMatch 在 / 未找到带有参数“(10,)”的“post-detail”的反向。尝试了 1 种模式：['post/int:pk/$']

我已阅读 What is a NoReverseMatch error, and how do I fix it? 并且我知道它似乎找不到 post_detail.html 的 url。我查了很多类似的问题，但我找不到任何对我的案子有帮助的东西。我正在关注本教程：https://towardsdatascience.com/build-a-social-media-website-with-django-feed-app-backend-part-4-d82facfa7b3

我试图改变我在 urls.py 中声明我的网址的方式，但到目前为止似乎没有任何效果。我包括了相关的 python 和 html 文件，编辑了长度。

urls.py

from django.conf.urls import url, include
from myapp import views as core_views
from django.contrib.auth.views import LoginView, LogoutView
from django.contrib import admin

urlpatterns = [
url(r'^$', core_views.PostListView.as_view(), name ='home'),
url(r'^post/<int:pk>/$', core_views.post_detail, name='post-detail']

views.py

...
@login_required
def post_detail(request, pk):
  post = get_object_or_404(Post, pk=pk)
  user = request.user
  is_liked =  Like.objects.filter(user=user, post=post)
  if request.method == 'POST':
        form = NewCommentForm(request.POST)
        if form.is_valid():         
          data = form.save(commit=False)
          data.post = post
          data.username = user
          data.save()
          return redirect('post-detail', pk=pk)
  else:
        form = NewCommentForm()
  return render(request, 'feed/post_detail.html','post':post, 'is_liked':is_liked, 'form':form)
...

home.html

% extends 'base.html' %
...
 % for post in posts %
        <div class="card card-signin my-5">
          <div class="card-body">
            <a href=" post.user_name.profile.get_absolute_url "></a>
            <a class="text-dark" href=" post.user_name.profile.get_absolute_url "><b> post.user_name </b></a>
            <br><small class="text-muted">Posted on  post.date_posted </small>
            <br><br>
            <p class="card-text text-dark"> post.description </p>
          </div>
          <a href="% url 'post-detail' post.id %"></a><img class="card-img-top" src="post.pic.url" ></a>
          % if post.tags %
          <br>
          <p class="text-danger ml-3"><b>Tags: <i> post.tags </i></b></p>
          % endif %  
          <div class="card-footer">
            <a class="btn btn-outline-info" href="% url 'post-detail' %">Comments |  post.details.count </a>
          </div>
        </div>
        % endfor % 
...

models.py

...
class Post(models.Model):
    description = models.CharField(max_length=255, blank=True)
    pic = models.ImageField(upload_to='static/images')
    date_posted = models.DateTimeField(default=timezone.now)
    user_name = models.ForeignKey(User, on_delete=models.CASCADE)
    tags = models.CharField(max_length=100, blank=True)
    
    def __str__(self):
            return self.description
    
    def get_absolute_url(self):
            return reverse('post-detail', kwargs='pk': self.pk)
...

最后是错误跟踪

Environment:


Request Method: GET
Request URL: http://127.0.0.1:8000/

Django Version: 3.1.7
Python Version: 3.9.1
Installed Applications:
['django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'rest_framework',
 'pigeonpost',
 'crispy_forms']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware']


Template error:
In template myProject\backend\pigeonpost\templates\base.html, error at line 0
   Reverse for 'post-detail' with arguments '(10,)' not found. 1 pattern(s) tried: ['post/<int:pk>/$']
   1 : <!DOCTYPE html>
   2 : <html lang="en">
   3 :   <head>
   4 :     <meta name="viewport" content="width=device-width, initial-scale=1">
   5 :     <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css">
   6 :     <meta charset="UTF-8">
   7 :     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
   8 :     <meta charset="utf-8">
   9 :     <title>% block title %PigeonPost% endblock %</title>
   10 :   </head>

Traceback (most recent call last):
  File "myProject\lib\site-packages\django\core\handlers\exception.py", line 47, in inner
    response = get_response(request)
  File "myProject\lib\site-packages\django\core\handlers\base.py", line 204, in _get_response
    response = response.render()
  File "myProject\lib\site-packages\django\template\response.py", line 105, in render
    self.content = self.rendered_content
  File "myProject\lib\site-packages\django\template\response.py", line 83, in rendered_content
    return template.render(context, self._request)
  File "myProject\lib\site-packages\django\template\backends\django.py", line 61, in render
    return self.template.render(context)
  File "myProject\site-packages\django\template\base.py", line 170, in render
    return self._render(context)
  File "myProject\lib\site-packages\django\template\base.py", line 162, in _render
    return self.nodelist.render(context)
  File "myProject\lib\site-packages\django\template\base.py", line 938, in render
    bit = node.render_annotated(context)
  File "myProject\lib\site-packages\django\template\base.py", line 905, in render_annotated
    return self.render(context)
  File "myProject\lib\site-packages\django\template\loader_tags.py", line 150, in render
    return compiled_parent._render(context)
  File "myProject\lib\site-packages\django\template\base.py", line 162, in _render
    return self.nodelist.render(context)
  File "myProject\lib\site-packages\django\template\base.py", line 938, in render
    bit = node.render_annotated(context)
  File "myProject\lib\site-packages\django\template\base.py", line 905, in render_annotated
    return self.render(context)
  File "myProject\lib\site-packages\django\template\loader_tags.py", line 62, in render
    result = block.nodelist.render(context)
  File "myProject\lib\site-packages\django\template\base.py", line 938, in render
    bit = node.render_annotated(context)
  File "myProject\lib\site-packages\django\template\base.py", line 905, in render_annotated
    return self.render(context)
  File "myProject\lib\site-packages\django\template\defaulttags.py", line 211, in render
    nodelist.append(node.render_annotated(context))
  File "myProject\lib\site-packages\django\template\base.py", line 905, in render_annotated
    return self.render(context)
  File "myProject\lib\site-packages\django\template\defaulttags.py", line 446, in render
    url = reverse(view_name, args=args, kwargs=kwargs, current_app=current_app)
  File "myProject\lib\site-packages\django\urls\base.py", line 87, in reverse
    return iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs))
  File "myProject\lib\site-packages\django\urls\resolvers.py", line 685, in _reverse_with_prefix
    raise NoReverseMatch(msg)

Exception Type: NoReverseMatch at /
Exception Value: Reverse for 'post-detail' with arguments '(10,)' not found. 1 pattern(s) tried: ['post/<int:pk>/$']

任何事情都会有很大帮助！谢谢。

【问题讨论】：

【参考方案1】：

首先，最后一个标签有帖子详情 URL，但没有所需的整数变量。

第二，你不应该循环浏览帖子，因为它是一个单一的对象。

第三，根据您显示的视图，没有名为“posts”的上下文变量。这是帖子。

【讨论】：

感谢您的第一句话。对于另外两个，这是因为我将它们显示在我的页面上的列表中。这都是在文件的其他部分中定义的并且可以正常工作。仅当我尝试实现注释选项时才会遇到此错误消息。另外，这并不能解决我的问题【参考方案2】：

我已经解决了我的问题！我需要更改调用网址的方式，因为这是旧方式。

 path('post/<int:pk>/', core_views.post_detail, name='post-detail')

这是正确的做法。

【讨论】：

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