Created
April 13, 2020 16:58
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if unique_together found duplicates in existing database
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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() | |
) |
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