Why doesn't django link open?

Question

Django

I get an error 404, I don’t understand what the problem is, I copy someone else’s code, but the same

views error

from django.shortcuts import render, get_object_or_404
from .models import Post


def post_list(request):
    posts = Post.objects.order_by('publish')
    return render(request,
                  'blog/post/list.html',
                  {'posts': posts})


def post_detail(request, year, month, day, post):
    post = get_object_or_404(Post, slug=post,
                             status='published',
                             publish__year=year,
                             publish__month=month,
                             publish__day=day)
    return render(request,
                  'blog/post/detail.html',
                  {'post': post})

models

from django.db import models
from django.utils import timezone
from django.contrib.auth.models import User
from django.urls import reverse


class PublishedManager(models.Manager):
    def get_queryset(self):
        return super(PublishedManager, self).get_queryset().filter(status='published')


class Post(models.Model):
    STATUS_CHOICES = (
        ('draft', 'Draft'),
        ('published', 'Published'),
    )
    title = models.CharField(max_length=250)
    slug = models.SlugField(max_length=250,
                            unique_for_date='publish')
    author = models.ForeignKey(User,
                               on_delete=models.CASCADE,
                               related_name='blog_posts')
    body = models.TextField()
    publish = models.DateTimeField(default=timezone.now)
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)
    status = models.CharField(max_length=10,
                              choices=STATUS_CHOICES,
                              default='draft')

    objects = models.Manager()  # The default manager.
    published = PublishedManager()  # Our custom manager.

    class Meta:
        ordering = ('-publish',)

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse('blog:post_detail',
                       args=[self.publish.year,
                             self.publish.month,
                             self.publish.day,
                             self.slug])

blog\urls

from django.urls import path
from . import views

app_name = 'blog'
urlpatterns = [
    # post views
    path('', views.post_list, name='post_list'),
    path('<int:year>/<int:month>/<int:day>/<slug:post>/',
         views.post_detail,
         name='post_detail'),
]

mysite\urls

from django.urls import path, include
from django.contrib import admin

urlpatterns = [
    path('admin/', admin.site.urls),
    path('blog/', include('blog.urls', namespace='blog')),
]

Answer 1

The error says that the post was not found according to the given parameters.
And the way you have it, get_obj_or_404 , then you get 404 as a result ..