django model remove duplicates

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Till
21 Nov 2017
1for instance in Stock.objects.all():
2			if instance.category == category:
3				raise forms.ValidationError(str(category) + ' is already created')
4		return category
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Elisa
13 May 2020
1from django.db.models import Count
2from app.models import Email
3
4duplicate_emails = Email.objects.values('email').annotate(email_count=Count('email')).filter(email_count__gt=1)
5
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