sharix-open-tickets/views/ticket_list_list.py

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

from tickets.forms import TicketListForm
from tickets.models import TicketList


class TicketListView(LoginRequiredMixin, ListView):
    model = TicketList
    template_name = "tickets/ticket_list_list.html"
    context_object_name = "ticket_lists"

    def get_queryset(self):
        user = self.request.user
        user_groups_ids = user.groups.all().values_list("pk", flat=True)
        ticket_lists = TicketList.objects.select_related("group").order_by("group__name", "name")

        if user_groups_ids:
            ticket_lists = ticket_lists.filter(group__id__in=user_groups_ids)
        else:
            messages.warning(
                self.request,
                "You do not yet belong to any groups. Ask your administrator to add you to one."
            )
            ticket_lists = TicketList.objects.none()

        return ticket_lists

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["form"] = TicketListForm(self.request.user)
        return context