Great, now that you have it available, add the LoginRequiredMixin to the create, update, and delete views.

from django.views import generic
from django.contrib.auth.mixins import LoginRequiredMixin

from . import models


class ArticleList(generic.ListView):
    model = models.Article


class ArticleDetail(generic.DeleteView, generic.DetailView):
    model = models.Article
    template_name = 'articles/article_detail.html'


class ArticleCreate(generic.CreateView, LoginRequiredMixin):
    fields = ('title', 'body', 'author', 'published')
    model = models.Article


class ArticleUpdate(generic.UpdateView, LoginRequiredMixin):
    fields = ('title', 'body', 'author', 'published')
    model = models.Article


class ArticleDelete(generic.DeleteView, LoginRequiredMixin):
    model = models.Article


class ArticleSearch(generic.ListView):
    model = models.Article

    def get_queryset(self):
        qs = super().get_queryset()
        term = self.kwargs.get('term')
        if term:
            return qs.filter(body__icontains=term)
        return qs.none()