pk argument on Django blog-CodePudding

I'm working on a blog and I was following instructions but now I don't understand why I have problem with pk.

This is my views.py

from django.shortcuts import render, get_object_or_404
from django.utils import timezone
from .models import Category, Post

def post_list(request):
    posts =  Post.objects.filter(created_at__lte=timezone.now()).order_by('created_at')
    latest_posts =  Post.objects.filter(created_at__lte=timezone.now()).order_by('created_at')[:9]

    context = {'posts': posts, 'latest_posts': latest_posts}
    return render(request, 'home.html', context)

def post_detail(request, post, pk):
    latest_posts =  Post.objects.filter(created_at__lte=timezone.now()).order_by('created_at')[:9]
    post = get_object_or_404(Post, pk=pk)

    context = {'post': post, 'latest_posts': latest_posts}
    return render(request, 'post_detail.html', context)

This is blog/urls.py

urlpatterns = [
    path('', views.post_list, name='home'),
    path('<slug:post>/', views.post_detail,  name='post_detail'),
]

This is models.py

class Post(models.Model):
    created_at = models.DateTimeField(auto_now_add=True, verbose_name="Created at")
    updated_at = models.DateTimeField(auto_now=True, verbose_name="Updated at")
    is_published = models.BooleanField(default=False, verbose_name="Is published?")
    published_at = models.DateTimeField(null=True, blank=True, editable=False, verbose_name="Published at")
    title = models.CharField(max_length=200, verbose_name="Title")
    slug = models.SlugField(max_length=200, unique=True)
    author = models.ForeignKey('auth.User', verbose_name="Author", on_delete=models.CASCADE)
    category = models.ForeignKey(Category, verbose_name="Category", on_delete=models.CASCADE)
    body = RichTextField(blank=True, null=True)
    image = StdImageField(upload_to='featured_image/%Y/%m/%d/', variations={'standard':(1170,820),'banner':(1170,530),'thumbnail':(500,500)})
    status = models.IntegerField(choices=STATUS, default=0)

    def get_absolute_url(self):
        return reverse('post_detail', args=[self.slug])

    class Meta:
        verbose_name = "Post"
        verbose_name_plural = "Posts"
        ordering = ['-created_at']

    def publish(self):
        self.is_published = True
        self.published_at = timezone.now()
        self.save()

    def __str__(self):
        return self.title

Also, I'm adding a list of post, it might be connected with get_absolute_url


{% extends "base.html" %}
{% load static %} 
    {% block content %}
    <!-- Main Wrap Start -->
    <main >
        <div >
            {% for post in latest_posts %}
            <div >
                <div >
                    <div >
                        <!--<span ><i ></i></span>-->
                        <a href="{{ post.get_absolute_url }}">
                            <img  src="{{ post.image.standard.url }}" alt="post-slider">
                        </a>
                    </div>
                    <h6 >
                        <a href="{{ post.get_absolute_url }}">{{ post.title }}</a>
                    </h6>
                    <div >
                        <span >By <a href="#">{{ post.author }}</a></span>
                        <span >{{ post.created_at}}</span>
                    </div>
                </div>
            </div>
            {% endfor %}
        </div>
    </main>
    {% endblock content%}

I have an error...

post_detail() missing 1 required positional argument: 'pk'

Everything was working until I was started working on post detail. Any ideas why this is happening?

CodePudding user response：

You seem to be confused with what the primary key for your model is. The primary key is the auto-generated id (pk) but according to your urls.py you want to use slug for fetching records.

First, change your path to:

path('<slug:slug>/', views.post_detail, name='post_detail'),

then your view signature to:

def post_detail(request, slug):

and finally, fetch your record using:

post = get_object_or_404(Post, slug=slug)