[Django]-Django rest framework unique together error message not displayed anymore

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10👍

DRF doesn’t validate UniqueConstraints the way it does unique_together.

The reason for this is because unique constraints can be more complex than just "this collection of fields must have unique values". Consider the following:

UniqueConstraint(
    fields=["author", "slug"],
    condition=Q(status="published"),
    name="author_slug_published_uniq",
)

This constraint only validates that the row is unique if the status is published, i.e. there can be multiple rows with the same slug and author if they are all drafts. Because of this complexity, there isn’t a validator for this. However, for this simple case, you can add DRF’s UniqueTogether validator manually:

class ClientSerializer(serializers.ModelSerializer):
    class Meta:
        fields = ["id", "name", "description", "company"]
        validators = [
            UniqueTogetherValidator(
                queryset=Client..objects.all(),
                fields=["name", "company"],
            )
        ]
👤Tom Carrick

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