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

You can use UniqueConstraint in case you're using Django 2.2+ Here is an example

class MyModel(models.Model):
    field_a = models.CharField()
    field_b = models.CharField()
    validated = models.BooleanField(default=False)

    class Meta:
        constraints = [
            UniqueConstraint(fields=['field_a', 'field_b'], condition=Q(validated=True), name='unique_field_a_field_b_validated')
        ]

here is the source