boards/management/commands/cleansettings.py

from importlib import import_module

from django.core.management import BaseCommand
from django.db import transaction
from django.conf import settings

from boards.models.user import UserSettings


SessionStore = import_module(settings.SESSION_ENGINE).SessionStore

__author__ = 'neko259'


class Command(BaseCommand):
    help = 'Remove user settings that do not have their sessions.'

    @transaction.atomic
    def handle(self, *args, **options):

        count = 0
        for setting in UserSettings.objects.all():
            session = SessionStore(session_key=setting.session_key)
            if session.is_empty():
                setting.delete()
                count += 1
        print('Removed {} empty setting objects.'.format(count))