Serializer validation
Implement
validate(self, data)
methodFile :
book/serializers.py
class AuthorSerializer(serializers.ModelSerializer): class Meta: model = Author fields = '__all__' def validate(self, data): """ Check that start is before finish. """ first_name = data["first_name"] last_name = data["last_name"] query = Author.objects.filter( first_name=first_name, last_name=last_name) authors = query.all() if len(authors) > 0: raise serializers.ValidationError("Author already exist") return data
If invalid raise error; otherwise, return data.
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