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43 lines
1.2 KiB
Python
43 lines
1.2 KiB
Python
""" 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 = {
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"%s__isnull" % r.name: True for r in models.Edition._meta.related_objects
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}
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# no cover, no identifying fields
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filters["cover"] = ""
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null_fields = {
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"%s__isnull" % f: True for f in ["isbn_10", "isbn_13", "oclc_number"]
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}
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editions = (
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models.Edition.objects.filter(
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Q(languages=[]) | Q(languages__contains=["English"]),
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**filters,
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**null_fields
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)
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.annotate(Count("parent_work__editions"))
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.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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)
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print(editions.count())
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editions.delete()
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class Command(BaseCommand):
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"""deduplicate 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 deduplications"""
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remove_editions()
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