Миксины в Django CBV

from django.contrib.auth.mixins import LoginRequiredMixin

class TaskListView(LoginRequiredMixin, ListView):
    model = Task
    login_url = '/login/'           # куда редиректить
    redirect_field_name = 'next'    # параметр для возврата

from django.contrib.auth.mixins import PermissionRequiredMixin

class TaskCreateView(PermissionRequiredMixin, CreateView):
    model = Task
    permission_required = 'tasks.add_task'
    # или несколько прав:
    permission_required = ['tasks.add_task', 'tasks.view_project']

from django.contrib.auth.mixins import UserPassesTestMixin

class TaskEditView(UserPassesTestMixin, UpdateView):
    model = Task

    def test_func(self):
        task = self.get_object()
        return self.request.user == task.owner

class OwnerRequiredMixin:
    """Разрешает доступ только владельцу объекта."""

    def get_queryset(self):
        qs = super().get_queryset()
        return qs.filter(owner=self.request.user)

class TaskDetailView(LoginRequiredMixin, OwnerRequiredMixin, DetailView):
    model = Task

# Правильный порядок: миксины ПЕРЕД базовым классом
class TaskView(LoginRequiredMixin, OwnerRequiredMixin, DetailView):
    ...

# НЕправильно: базовый класс первым
class TaskView(DetailView, LoginRequiredMixin):  # LoginRequired не сработает
    ...