python - 类型错误 : index() missing 1 required positional argument: 'subject_slug'

Question

我已经使用django 创建了一个博客。现在我正在尝试实现一个系统，其中每个帖子的 url 将包含 subject_slug/slug。错误如上题。

来自终端的错误更详细:response = wrapped_callback(request, *callback_args, **callback_kwargs)类型错误:index() 缺少 1 个必需的位置参数:'subject_slug'

模型.py

    from django.conf import settings
from django.db import models
from django.utils import timezone
from django.contrib.auth.models import User
from django.urls import reverse
from django.utils.text import slugify

class Subject(models.Model):
    subject = models.CharField(max_length=200)
    subject_slug = models.SlugField(editable=True, max_length=200, null=False, unique=True)
    def get_absolute_url(self):
        kwargs = {
            'slug': self.slug
        }
        return reverse('subject', kwargs=kwargs)
    def save(self, *args, **kwargs):
        value = self.subject
        self.slug = slugify(value, allow_unicode=True)
        super().save(*args, **kwargs)
    
    class Meta:
        # Gives the proper plural name for class called subject
        verbose_name_plural = "Subjects"

    def __str__(self):
        return self.subject

class Post(models.Model):
    author = models.ForeignKey(User, default=1, on_delete=models.SET_DEFAULT, related_name='blog_posts')
    date_added = models.DateTimeField(auto_now_add=True)
    subject = models.ForeignKey(Subject, verbose_name='Subject', default=1, on_delete=models.SET_DEFAULT)   
    title = models.CharField(max_length=200, unique=True)
    slug = models.SlugField(editable=True, max_length=200, null=False, unique=True)
    content = models.TextField()
    def get_absolute_url(self):
        kwargs = {
            'slug': self.slug
        }
        return reverse('post_detail', kwargs=kwargs)
    def save(self, *args, **kwargs):
        value = self.title
        self.slug = slugify(value, allow_unicode=True)
        super().save(*args, **kwargs)
    
    class Meta:
        ordering = ['-date_added']
        
    def __str__(self):
        return self.title
        
class Comment(models.Model):
    post = models.ForeignKey(Post, default=1, on_delete=models.SET_DEFAULT, related_name='comments')
    name = models.CharField(max_length=80)
    email = models.EmailField()
    body = models.TextField()
    made_on = models.DateTimeField(auto_now_add=True)
    active = models.BooleanField(default=False)

    class Meta:
        ordering = ['made_on']

    def __str__(self):
        return 'Comment {} by {}'.format(self.body, self.name)

网址.py

    from django.urls import path
from . import views

urlpatterns = [
    # Home page.
    path('', views.index, name='index'),
    # A page for each subject.
    path('<str:subject_slug>/', views.subject, name='subject'),
    # A page for each post including comments related to the post.
    path('<str:subject_slug>/<str:slug>/', views.post_detail, name='post_detail'),
    # Not sure I need this if I am to be the only author of posts.
    path('post/new/', views.post_new, name='post_new'),
]

View .py

    from django.shortcuts import render, get_object_or_404, redirect
from django.utils import timezone
from django.views import generic
from .models import Subject
from .models import Post
from .forms import PostForm
from .forms import CommentForm

# Create your views here.

def index(request, subject_slug):
    """All subjects to be shown automatically in navbar - in base template ideally?
    Order_by needs fixing"""
    subjects = Subject.objects.all()
    subject = get_object_or_404(subject_slug=subject_slug)
    posts = Post.objects.filter(date_added__lte=timezone.now()).order_by('-date_added')
    return render(request, 'blog/index.html', {'subjects': subjects,
                                               'subject': subject,
                                               'posts': posts})

def subject(request, subject_slug):
    template_name = 'blog/subject.html'
    subjects = Subject.objects.all()
    subject = Subject.objects.get(subject_slug=subject_slug)
    posts = Post.objects.filter(date_added__lte=timezone.now()).order_by('-date_added')
    return render(request, template_name, {'subjects': subjects,
                                           'subject': subject,
                                           'posts': posts})
    

def post_detail(requests, subject_slug, slug):
    template_name = 'blog/subject/post_detail.html'
    subjects = Subject.objects.all()
    post = get_object_or_404(Post, subject_slug=subject_slug, slug=slug)
    comments = post.comments.filter(active=True)
    new_comment = None
    # Comment posted
    if request.method == 'POST':
        comment_form = CommentForm(data=request.POST)
        if comment_form.is_valid():
            
            # Create comment object but don't save to database yet
            new_comment = comment_form.save(commit=False)
            # Assign the current post to the comment
            new_comment.post = post
            # Save the comment to the database
            new_comment.save()
    else:
            comment_form = CommentForm()
            
    return render(request, template_name, {'subjects': subjects,
                                           'subject': subject,
                                           'post': post,
                                           'comments': comments,
                                           'new_comment': new_comment,
                                           'comment_form': comment_form})

基础.html

    {% load static %}
<html>
  <head>
    <title>drsmart.info</title>
    <link rel="stylesheet" href="{% static 'css/blog.css' %}">
  </head>

  <body>
    <h1><a href="/">DR SMART.INFO</a></h1>
    <p>the web site for the analytical rugby fan</p>
    <p>
      <ul>
        {% for subject in subjects %}
          <li><a href="{% url 'subject' subject.subject_slug %}">{{ subject }}</a></li>
        {% endfor %}
      </ul> 
    </p>
    
    {% block content %}
    {% endblock %}
  </body>
</html>

index.html

{% extends 'blog/base.html' %}

{% block content %}
  {% for post in posts %}
    <div>
      <h2><a href="{% url 'post_detail' post.slug %}">{{ post.title }}</a></h2>
      <p>author: {{post.author}}, published: {{post.date_added }}</p>
      <p>{{ post.content|linebreaksbr }}</p>
    </div>
  {% endfor %}
{% endblock %}

非常感谢您的帮助。

罗德里克

Answer 1

在index.html , 在这一行 <h2><a href="{% url 'post_detail' post.slug %}">{{ post.title }}</a></h2> ，缺少第二个参数应该是这样的

<h2><a href="{% url 'post_detail' post.subject.subject_slug post.slug %}">{{ post.title }}</a></h2>

编辑:在你的views.py您的索引 View 在定义中有一个参数:

def index(request, subject_slug):

但是在其各自的url中，没有参数，所以会报错

path('', views.index, name='index'),

所以解决方案是 View 应该是这样的:

def index(request):

或者url应该是这样的:

path('<subject_slug>', views.index, name='index'),