Цикл не выводит содержимое модели

#models.py
from django.db import models
 
# Категории
class Category(models.Model):
    name = models.CharField(max_length=50)
    slug = models.SlugField()
 
    def __str__(self):
        return self.name
 
def generate_filename(instance, filename):
    filename = instance.slug + '.jpg'
    return "{0}/{1}".format(instance, filename)
 
 
# Модель статьи
class Article(models.Model):
    category = models.ForeignKey('Category', on_delete=models.CASCADE)
    title = models.CharField(max_length=120)
    slug = models.SlugField()
    image = models.ImageField(upload_to=generate_filename)
    content = models.TextField()
    likes = models.PositiveIntegerField(default=0)
    dislikes = models.PositiveIntegerField(default=0)
 
 
# Отображ. статьи по названию
    def __str__(self):
        return self.title

#views.py
from django.shortcuts import render
from .models import *
# Create your views here.
 
def post_list(request):
    posts = Article.objects.all()
    return render(request, 'mediaportalapp/index.html', context={'posts': posts})
 
def category_list(request):
    cats = Category.objects.all()
    return render(request, 'mediaportalapp/index.html', context={'cats': cats})

#index.html
{% for cat in cats %}
         {{ cat }}
 {% endfor %}

def category_list(request):
    cats = Category.objects.all()
    return render(request, 'mediaportalapp/index.html', context={'cats': cats})

from django.urls import path
from .views import *
 
urlpatterns = [
    path('', post_list),
    path('', category_list)
]

<li>
      {% for cat in cats %}
           {{ cat }}
      {% endfor %}
 </li>

from django.urls import path
from .views import *
 
urlpatterns = [
    path('', post_list, name='post'),
    path('category', category_list, name='category')
]