sharix-open-tickets/views/ticket_list_list.py

from django.contrib import messages
from django.contrib.auth.mixins import LoginRequiredMixin
from django.db.models import Count, Sum, Q
from django.views.generic import ListView

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


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 not user.is_superuser:
            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