Django: Implementing a referral program

Question

I have an ecommerce website that works in a classical way: people sign up, buy a product with their CC.

It uses the default Django auth system for users and registration

Answer 1

You could use a very simple model to keep track of them

class UserReferral(models.Model):
    referrer = models.ForeignKey(User)
    referred = models.ForeignKey(User)

    class Meta:
        unique_together = (('referrer', 'referred'),)

Then you can count how many a user has referred:

UserReferral.objects.filter(referrer=user).count()

Etc..