Problem with unique_together and field override in ModelSerializer

[Michael Goffioul]

I have the following model:

class UnitData(models.Model):

    unit = models.ForeignKey(Unit, on_delete=models.CASCADE)

    key = models.CharField(max_length=64)

    data = models.TextField(blank=True)

    class Meta:

        unique_together = ["unit", "key"]

I would like to rename the field 'unit' to 'device' in my serializer, so I've used the following:

class UnitDataBatchSerializer(serializers.HyperlinkedModelSerializer):

    device = serializers.HyperlinkedRelatedField(

            source='unit',

            view_name='unit-detail',

            queryset=Unit.objects.all())

    class Meta:

        model = UnitData

        fields = [ 'device', 'key', 'data' ]

However, I'm getting an exception when validating posted data. It appears the UniqueTogetherValidator will try to access the 'unit' field in the serializer, but it doesn't exist:

https://github.com/encode/django-rest-framework/blob/master/rest_framework/validators.py#L109

Is that expected? Or a bug? Is there a better way to rename the field in the serializer?

Thanks,

Michael.

[Carl Nobile]

You may have to override the UniqueTogetherValidator to use the correct field.

https://www.django-rest-framework.org/api-guide/validators/#uniquetogethervalidator

~Carl

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Carl J. Nobile (Software Engineer)
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