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