Один класс на два шаблона

class Articles(ListView):
    model = Article
    template_name = 'articles/articles.html'
    context_object_name = 'articles'
    paginate_by = 10
    articles = Article.objects.filter(is_published=True)
 
    def get_queryset(self):
        return self.articles
 
 
class ShowArticle(DetailView):
    model = Article
    template_name = 'articles/conrete_article.html'
    slug_url_kwarg = 'article_slug'
    context_object_name = 'article'

class Main(ListView):  
    articles = Article.objects.filter(is_published=True)
 
    def get_queryset(self):
        main_page = self.articles.filter(is_main_page=True)
        if main_page.exists():
            self.template_name = 'articles/conrete_article.html'
            self.context_object_name = 'article'
            return self.articles.filter(is_main_page=True).first()
        else:
            self.model = Article
            self.template_name = 'articles/articles.html'
            self.context_object_name = 'articles'
            self.paginate_by = 10
            return self.articles

class ArticleMixin():
    model = Article
    template_name = 'articles/articles.html'
    context_object_name = 'articles' 
    articles = Article.objects.filter(is_published=True)
 
    def get_queryset(self):
        return self.articles
 
 
class Articles(ArticleMixin, ListView):
    paginate_by = 10
 
 
class ShowArticle(DetailView):
    model = Article
    template_name = 'articles/conrete_article.html'
    slug_url_kwarg = 'article_slug'
    context_object_name = 'article'
 
 
class Main(ArticleMixin, ListView):
    def __init__(self):
        self.main_page = self.articles.filter(is_main_page=True)
 
    def get_queryset(self):
        if self.main_page.exists():
            self.template_name = 'articles/conrete_article.html'
            self.context_object_name = 'article'
            return self.articles.filter(is_main_page=True).first()
        else:
            self.paginate_by = 10
            return self.articles