Django set range for integer model field as constraint

Question

I have a django model,

class MyModel(models.Model)
    qty = model.IntegerField()

where I want to set constraint for qty somet

Answer 1

Since Django 2.2 you can enforce the constraints on a database level with CheckConstraint:

from django.db import models

class MyModel(models.Model)
    qty = model.IntegerField()

    class Meta:
        constraints = [
            models.CheckConstraint(
                check=models.Q(qty__gte=1) & models.Q(qt__lte=10),
                name="A qty value is valid between 1 and 10",
            )
        ]