Multi tenancy support about django-admin-interface HOT 4 OPEN

from django.conf import settings

def is_sites_app_installed():
    if 'django.contrib.sites' in settings.INSTALLED_APPS:
        try:
            from django.contrib.sites.models import Site
            return True
        except ImportError:
            return False
    return False

    site = models.PositiveSmallIntegerField(  # it can be a FK too
        blank=True,
        default=1,
        verbose_name=_("site"),
    )

class ThemeQuerySet(models.QuerySet):
    def get_active(self):
        using_sites_framework = is_sites_app_installed()

        if using_sites_framework:
            objs_active_qs = self.filter(active=True, site=Site.objects.get_current().id)  # `Site.objects.get_current()` is `site` is a FK
        else:
            objs_active_qs = self.filter(active=True)

        objs_active_ls = list(objs_active_qs)
        objs_active_count = len(objs_active_ls)

        if objs_active_count == 0:
            obj = self.all().first()
            if obj:
                obj.set_active()
            else:
                obj = self.create()

        elif objs_active_count == 1:
            obj = objs_active_ls[0]

        elif objs_active_count > 1:
            obj = objs_active_ls[-1]
            obj.set_active()

        return obj