About Removing Duplicates in the Database

To find and remove records with duplicate values in the database you can do this:

1
2
3
4
5
for duplicates in Tag.objects.values("name").annotate(
    records=Count("name")
).filter(records__gt=1):
    for tag in Tag.objects.filter(name=duplicates["name"])[1:]:
        tag.delete()

Tips and Tricks Programming Refactoring Django 4.2 Django 3.2 Django 2.2 Django 1.11 Django 1.8