Django | Page not found (404) No Cars matches the given query

I tried to create a form for creating a new article on the site, but this error came out. I've rechecked everything 10 times, but I don't understand what the error is.

hello/ :

from django.urls import path
from . import views

urlpatterns = [
    path('', views.index, name='hello'),
    path("cars/<slug:car_slug>/", views.car_slug, name='car_slug'),
    path('cars/addpost/', views.addpost, name='addpost')


hello/ :

from django.shortcuts import get_object_or_404, render, redirect
from .models import *
from .forms import *

def index(request):
    data = {}
    return render(request, 'hello/index.html', data)

def car_slug(request, car_slug):
    car = get_object_or_404(Cars, slug=car_slug)
    data = {
        'car': car
    return render(request, 'hello/car_pk.html', data)

def addpost(request):
    if request.method == 'POST':
        form = AddPostForm(request.POST)
        if form.is_valid():
            return redirect("hello")
            form.add_error(None, "Ошибка добавления поста")

        form = AddPostForm()

    data = {
        'form': form,
        'title': 'Добавление поста'

    return render(request, 'hello/addpost.html', data)


from django import forms

from .models import *

class AddPostForm(forms.Form):
    title = forms.CharField(label='Название', max_length=300)
    slug = forms.SlugField(label='URL', max_length=40)
    content = forms.CharField(label='Характеристика', widget=forms.Textarea(attrs={'cols':60, 
'rows': 10}))
    is_published = forms.BooleanField(label='Состояние', required=False, initial=True)
    brand = forms.ModelChoiceField(queryset=Brands.objects.all(), label="Бренды", 
empty_label='Не выбрано')

hello/ :

from django.urls import reverse
from django.db import models

class Cars(models.Model):
    title = models.CharField(max_length=255, verbose_name="Название")
    slug = models.SlugField(verbose_name="URL", unique=True, db_index=True, max_length=255)
    content = models.TextField(verbose_name="Характеристика", null=True)
    time_create = models.DateField(verbose_name='Дата публикации', auto_now_add=True)
    is_published = models.BooleanField(default=True )
    brand = models.ForeignKey('Brands', on_delete=models.PROTECT)

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse('car_slug', kwargs={'car_slug': self.slug})

    class Meta:
        verbose_name = 'Машины'
        verbose_name_plural = 'Машины'

class Brands(models.Model):
    name = models.CharField(verbose_name="Бренды", max_length=250)
    slug = models.SlugField(verbose_name="URL", unique=True, db_index=True, max_length=255)

    def __str__(self):

    class Meta:
        verbose_name = "Бренды"
        verbose_name_plural = 'Бренды'

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Does it show up in the Shell? python shell

from hello.models import Cars

# if above is empty run this:
for i in Cars.objects.all():
    print('slug:', i.slug)

I think the issue might be that slug Url field.. cause it validations as a full Url. When going to that View you are only passing it addpost which wouldn't be a full Url ..maybe just change that field to a CharField

and in the addpost View, inside the form.is_valid(), it can be like:

if form.is_valid():
    return redirect("hello")

Might be better to do it that way so the Forms are in the Forms & Views are in the Views.

Use this code and check

def car_slug(request, car_slug):
    car = Cars.object.filter(slug=car_slug)
    data = {
        'car': car
    return render(request, 'hello/car_pk.html', data)

show us the error from your terminal

Try to test again with ASCII characters slug.

It looks like you are generating some Unicode characters which will not work with django slug

According to their docs

slug - Matches any slug string consisting of ASCII letters or numbers, plus the hyphen and underscore characters. For example, building-your-1st-django-site.

So in order to work with Unicode slug, change your router path to:

path(r'cars/(?P<slug>[^/.]+)/', views.car_slug, name='car_slug'),

Update the regex part [^/.]+ if you need something else to validate the path.

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