moviewyrm/bookwyrm/management/commands/remove_editions.py
2021-01-30 18:30:07 -08:00

34 lines
1.1 KiB
Python

''' PROCEED WITH CAUTION: this permanently deletes book data '''
from django.core.management.base import BaseCommand
from django.db.models import Count, Q
from bookwyrm import models
def remove_editions():
''' combine duplicate editions and update related models '''
# not in use
filters = {'%s__isnull' % r.name: True \
for r in models.Edition._meta.related_objects}
# no cover, no identifying fields
filters['cover'] = ''
null_fields = {'%s__isnull' % f: True for f in \
['isbn_10', 'isbn_13', 'oclc_number']}
editions = models.Edition.objects.filter(
Q(languages=[]) | Q(languages__contains=['English']),
**filters, **null_fields
).annotate(Count('parent_work__editions')).filter(
# mustn't be the only edition for the work
parent_work__editions__count__gt=1
)
print(editions.count())
editions.delete()
class Command(BaseCommand):
''' dedplucate allllll the book data models '''
help = 'merges duplicate book data'
# pylint: disable=no-self-use,unused-argument
def handle(self, *args, **options):
''' run deudplications '''
remove_editions()