[Answered ]-How to code unique constraint per parent ForeignKey in Django model?

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1👍

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You work with a UniqueConstraint [Django-doc]:

class Child(models.Model):
    parent = models.ForeignKey(Parent, on_delete=models.CASCADE)
    name = models.CharField(max_length=50)

    def __str__(self):
        return f'{self.name}'

    class Meta:
        constraints = [
            models.UniqueConstraint(
                fields=('name', 'parent_id'), name='unique_child_name_per_parent'
            )
        ]
👤willeM_ Van Onsem

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