Foreign key modèle Order

class Order(models.Model):
    # user peut avoir plusieurs order
    user = models.ForeignKey(AUTH_USER_MODEL, on_delete=models.CASCADE)
    # un seul product par order
    product = models.ForeignKey(Product, on_delete=models.CASCADE)
    quantity = models.IntegerField(default=1)
    ordered = models.BooleanField(default=False)

    def __str__(self):
        return f"{self.product.name} - {self.quantity}"