Unique together constraint including specific field value

Question

For one of my models, I need to ensure the unicity of some rows, but only in a certain case. Only the \"validated\" rows should follow this constraint.

Basically, I\'

Answer 1

In addition to the previous answer you can overwrite the save() method. It would be something like this:

def save(self, **kwargs):
    try:
        self.objects.get(field_a=self.field_a, field_b=self.field_b, validated=True)

        # The object already exist therefore throw an exception
        raise ValidationError(
            "field_a and field_b must be unique if validated=True"
        ) 

    except self.__class__.DoesNotExist:  # Save the model
        super(MyModel, self).save(**kwargs)  # inherit and call the save method

Now you don't need to call the clean() method.