未找到参数为 '('',)' 的 'article_detail' 反转尝试了 1 个模式：['article/(?P<pk>[0-9]+)$']

问题描述

我在不同的模板上经常出现错误，我写了一个博客，一旦我清除了 category_detail，一切都正常了，显然里面有错误

category_detail.html

{% extends 'base.html' %}
{% block content %}

{% if category_posts %}


  <h1>{{ cat }}</h1>


  <ul>
    {% for post in category_posts %}
  <l1><a href="{% url 'article_detail' post.pk %}">{{ post.title }}</a>
    {{ post.category }}
     | {{ post.author }}
     {% if user.is_authenticated %}
     |-<small><a href="{% url 'update_post' post.pk %}">Редакт..)</a></small>
     {% endif %}
     <br/>{{ post.body|slice:":50"|safe }}
   </l1>
   {% endfor %}
   </ul>


 {% else %}
 <h1>Извините страница не найдена</h1>
 {% endif %}
{% endblock %}

如果我不为类别添加代码和模板，一切正常。 输入代码

views.py

class HomeView(ListView):
    model = Post
    template_name = 'home.html'
    ordering = ['-id']

def CategoryView(request,cats):
    category_posts = Post.objects.filter(category=cats),return render(request,'category_detail.html',{'cats':cats.title(),'category_posts':category_posts})


class ArticleDetailView(DetailView):
    model = Post
    template_name = 'post_detail.html'

class AddPostView(CreateView):
    model = Post
    form_class = PostForm
    template_name= 'add_post.html'
    #fields = '__all__'

class AddCategoryView(CreateView):
    model = Category
    template_name= 'add_category.html'
    fields = '__all__'



class UpdatePostView(UpdateView):
    model = Post
    template_name = 'update_post.html'
    form_class = EditForm
    #fields = ['title','body']

class DeletePostView(DeleteView):
    model = Post
    template_name = 'delete_post.html'
    success_url = reverse_lazy('home')

models.py

from django.db import models
from django.contrib.auth.models import User
from django.urls import reverse
#from datetime import datetime,date
from django.utils import timezone

class Category(models.Model):
    name=models.CharField(max_length=255)

    def __str__(self):
        return self.name

    def get_absolute_url(self):
        return reverse('home')


class Post(models.Model):
    title = models.CharField(max_length=200)
    author = models.ForeignKey(User,on_delete=models.CASCADE)
    body = models.TextField()
    post_date = models.DateTimeField(auto_Now_add=True)
    category = models.CharField(max_length=200,default='разные')
    def __str__(self):
        return self.title + ' | ' + str(self.author)

    def get_absolute_url(self):
        return reverse('article_detail',args=[str(self.id)])

urls.py

urlpatterns = [
    path('',HomeView.as_view(),name='home'),path('article/<int:pk>',ArticleDetailView.as_view(),name='article_detail'),path('add_post/',AddPostView.as_view(),name='add_post'),path('add_category/',AddCategoryView.as_view(),name='add_category'),path('category/<str:cats>/',CategoryView,name='category'),path('article/edit/<int:pk>',UpdatePostView.as_view(),name='update_post'),path('article/<int:pk>/delete',DeletePostView.as_view(),name='delete_post'),]

home.html

{% extends 'base.html' %}
{% block content %}


<h1>Articles</h1>


{% for post in object_list %}


<ul>
    <l1><a href="{% url 'article_detail' post.pk %}">{{ post.title }}</a>
      <a href="{% url 'category' post.category %}">{{ post.category }}</a>
       | {{ post.author }}
      {% if user.is_authenticated %}
      |-<small><a href="{% url 'update_post' post.pk %}">Редакт..)</a></small>
      {% endif %}
      <br/>{{ post.body|slice:":50"|safe }}
    </l1>
</ul>
{% endfor %}

{% endblock %}

帮助解决问题，我已经坐了第二天

解决方法

我认为问题出在这一行：

category_posts = Post.objects.filter(category=cats),

您在行尾放置了 逗号(,) 符号。因此，category_posts 是 (,) 的元组，并且在模板中您正在迭代这个元组而不是查询集。改为：

category_posts = Post.objects.filter(category=cats)