tests/constraints/models.py


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from django.db import models


class Product(models.Model):
    name = models.CharField(max_length=255)
    price = models.IntegerField()
    discounted_price = models.IntegerField()

    class Meta:
        constraints = [
            models.CheckConstraint(
                check=models.Q(price__gt=models.F('discounted_price')),
                name='price_gt_discounted_price',
            ),
        ]