[FIXED] Articles matching query does not exist

Issue

I have just started working in Django. My problem in addressing with slug I get an error when sending a request to Slug.

This is my error: Articles matching query does not exist.

I also get an error when migrate.

This is my error: django.db.utils.OperationalError:table "bloges_category" already exists

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

    class Articles(models.Model):
        Writer = models.ForeignKey(User, on_delete=models.CASCADE)
        category = models.ManyToManyField(Category)
        Title = models.CharField(max_length=40, unique=True)
        Body = models.TextField()
        Image = models.ImageField(upload_to='articles')
        Time = models.DateTimeField(editable=False, auto_now_add=True)
        Update = models.DateTimeField(auto_now=True)
        slug = models.SlugField(blank=True, unique=True)
    
    def save(
            self, force_insert=False, force_update=False, using=None, update_fields=None):
        self.slug = slugify(self.Title)
        super(Articles, self).save()
    
    def get_absolute_url(self):
        return reverse("bloges:articles_detail", args=[self.slug])

my view:

 from django.shortcuts import render
    from bloges.models import Articles
    
    
    def post(request, slug):
        articles = Articles.objects.get(slug=slug)
        return render(request, 'bloges/post-details.html', {"postartic": articles})

my urls:

from django.urls import path
from . import views

app_name = 'bloges'
urlpatterns = [
    path("post/<slug:slug>", views.post, name="articles_detail")
]

Error after sending request:
Articles matching query does not exist.

Solution

I get an error when sending a request to Slug It is my error: Articles matching query does not exist.

This occurs based on your posted view called post not having a URL param named slug that matches the call in your view here: articles = Articles.objects.get(slug=slug).

This errors out because you use get(), which throws an error if the object searched for is not found. A common solution would be to use get_object_or_404(Articles, slug=slug), which would throw an HTTP 404 when the object is not found or to filter, i.e. articles = Articles.objects.filter(slug=slug) in which case if the variable articles is not available (i.e. if not articles, None, or Articles.objects.none(), you do what you wish.

Notice your URL param here:

urlpatterns = [
    path("post/<slug:slug>", views.post, name="articles_detail")
]

Which likely calls a URL like: http://localhost:8000/post/foo

Where foo is not a slug found in Articles here: Articles.objects.get(slug='foo')

And I get an error when migrate It is my error: django.db.utils.OperationalError: table "bloges_category" already exists

We need to see how your migrations are, and your current DB structure. Overall this error is stating you are running a migration that cannot complete because it is trying to create a table that is already there.

My first thought is that you accidentally deleted your migration files and re-ran makemigrations, or you removed your data from your migration table in the DB. But without more info it is hard to tell.

Answered By - ViaTech