Skip to content

Instantly share code, notes, and snippets.

@a4amaan
Created April 13, 2020 16:58
Show Gist options
  • Save a4amaan/3a2ae86d0464ddc50dab392dd68dbecd to your computer and use it in GitHub Desktop.
Save a4amaan/3a2ae86d0464ddc50dab392dd68dbecd to your computer and use it in GitHub Desktop.
if unique_together found duplicates in existing database
from django.db.models import Count, Max
unique_fields = ['field_1', 'field_2']
duplicates = (
MyModel.objects.values(*unique_fields)
.order_by()
.annotate(max_id=Max('id'), count_id=Count('id'))
.filter(count_id__gt=1)
)
for duplicate in duplicates:
(
MyModel.objects
.filter(**{x: duplicate[x] for x in unique_fields})
.exclude(id=duplicate['max_id'])
.delete()
)
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment