Рабoта с ListView, вывод списка статей

from django.views.generic import ListView

from .models import Article, Category


class ArticleListView(ListView):
    model = Article
    template_name = "blog/articles_list.html"
    context_object_name = "articles"

    def get_queryset(self):
        return Article.custom.all()

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["title"] = "Главная страница"
        return context

class ArticleByCategoryListView(ListView):
    model = Article
    template_name = "blog/articles_list.html"
    context_object_name = "articles"
    category = None

    def get_queryset(self):
        self.category = Category.objects.get(slug=self.kwargs["slug"])
        queryset = Article.objects.filter(category__slug=self.category.slug)
        return queryset

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["title"] = f"Статьи из категории: {self.category.title}"
        return context

categories = self.category.get_descendants(include_self=True)
return Article.custom.all().filter(category__in=categories)

from django.urls import path

from .views import ArticleByCategoryListView, ArticleListView

urlpatterns = [
    path("", ArticleListView.as_view(), name="home"),
    path("category/<str:slug>/", ArticleByCategoryListView.as_view(), name="articles_by_category"),
]

templates/
├── header.html
├── footer.html
├── main.html            ← базовый шаблон
├── src/                 ← статика (STATICFILES_DIRS)
│   ├── css/
│   └── js/
└── blog/
    └── articles_list.html

{% load static %}
<!doctype html>
<html lang="ru">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>{{ title }}</title>
</head>
<body>
  {% include "header.html" %}
  <div class="container">
    {% block content %}{% endblock %}
  </div>
  {% include "footer.html" %}
</body>
</html>

{% extends "main.html" %}

{% block content %}
  {% for article in articles %}
    <div class="card mb-3">
      <div class="row">
        <div class="col-4">
          {% if article.thumbnail %}
            <img src="{{ article.thumbnail.url }}" class="card-img-top" alt="{{ article.title }}">
          {% endif %}
        </div>
        <div class="col-8">
          <div class="card-body">
            <h5 class="card-title"><a href="{{ article.get_absolute_url }}">{{ article.title }}</a></h5>
            <a href="{{ article.category.get_absolute_url }}">{{ article.category.title }}</a>
            <p class="card-text">{{ article.short_description|safe|truncatechars:300 }}</p>
            <small class="text-muted">{{ article.time_create|date:"d.m.Y" }} · {{ article.author.username }}</small>
          </div>
        </div>
      </div>
    </div>
  {% empty %}
    <p>Статей пока нет.</p>
  {% endfor %}
{% endblock %}