Allow only positive decimal numbers

Question

Within my Django models I have created a decimal field like this:

price = models.DecimalField(_(u\'Price\'), decimal_places=2, max_digits=12)

O

Answer 1

Assuming this is your product model, and you want to add non-negative constraint on price field. You can add the meta constraint on the model:

class Product(models.Model):
    price = models.DecimalField(max_digits=13, decimal_places=2)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        managed = True
        db_table = 'product'
        constraints = [
            models.CheckConstraint(check=models.Q(price__gte='0'), name='product_price_non_negative'),
        ]