boards/management/commands/cleanfiles.py

import os
from boards.abstracts.constants import FILE_DIRECTORY

from django.core.management import BaseCommand
from django.db import transaction
from boards.models import Attachment

from neboard.settings import MEDIA_ROOT


__author__ = 'neko259'

THUMB_SIZE = (200, 150)


class Command(BaseCommand):
    help = 'Remove files whose models were deleted'

    @transaction.atomic
    def handle(self, *args, **options):
        thumb_prefix = '.{}x{}'.format(*THUMB_SIZE)

        count = 0
        model_files = os.listdir(MEDIA_ROOT + FILE_DIRECTORY)
        for file in model_files:
            model_filename = file if thumb_prefix not in file else file.replace(
                thumb_prefix, '')
            found = Attachment.objects.filter(file=FILE_DIRECTORY + model_filename)\
                .exists()

            if not found:
                print('Missing {}'.format(file))
                os.remove(MEDIA_ROOT + FILE_DIRECTORY + file)
                count += 1

        print('Deleted {} attachment files.'.format(count))