django prevent duplicate entries

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Bautista
28 Jan 2018
1for instance in Stock.objects.all():
2			if instance.category == category:
3				raise forms.ValidationError(str(category) + ' is already created')
4		return category
source
Pietro
23 Feb 2019
1if not table.objects.filter(column1=values).exists():
2    # Insert new data here
3    table.objects.create(column1=v1, column2=v2)
source
Blanche
26 May 2017
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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