class Category(models.Model):
    name = models.CharField(max_length=255)
    slug = models.SlugField(unique = True, default='', db_index=True)
    image = models.ImageField(upload_to='img/blog/category/detail', null=True, blank=True)
    image_header = ImageSpecField(source='image', format='JPEG', processors=[ResizeToFill(1920, 239)],
            options={'quality': 90})
    image_list = ImageSpecField(source='image', format='JPEG', processors=[ResizeToFill(1920, 239)],
            options={'quality': 90})

    class Meta:
        ordering = ('name',)
        verbose_name = 'category'
        verbose_name_plural = 'categories'

    def __str__(self):
        return self.name

    def get_absolute_url(self):
        return f'/blog/{self.slug}/'

# TEMPLATE

	{% if searched_category.image %}
	<section class="bg-title-page p-t-40 p-b-50 flex-col-c-m" style="background-image: url('{{ searched_category.image_header.url }}');">
	{% else %}
	<section class="bg-title-page p-t-40 p-b-50 flex-col-c-m" style="background-image: url({% static 'images/heading-pages-05.jpg' %});">
	{% endif %}

# VIEW
def post_list_by_category(request, category_slug):
    template_name = 'blog/blog.html'
    post_list = Post.objects.filter(category__slug=category_slug)
    searched_category = Category.objects.get(slug=category_slug)
    categories = Category.objects.all()

    paginator = Paginator(post_list, 5)
    page = request.GET.get('page')

    try:
        post_list = paginator.page(page)
    except PageNotAnInteger:
        post_list = paginator.page(1)
    except EmptyPage:
        post_list = paginator.page(paginator.num_pages)

    context = {
        'posts': post_list,
        'categories': categories,
        'searched_category': searched_category,
    }

    return render(request, template_name, context)

№CONFIG
STATIC_URL = '/static/'

MEDIA_URL = '/media/'
MEDIA_ROOT = 'media/'