Question

How do I build a website with referral link on Django, every user will have a link that has their name.

Answer 1

simple solution..
import hashlib

Refferal(Model):
    user = OneToOne(User)
    upline=ForeignKey(User, null=True, related_name='downlines')
    ref_code = CharField()

def gen_code(self):
    text = '%s' % self.id
    code = hashlib.md5(text.encode())
    return code.digest()

def save(self, *arg, kwargs):
     if self._state.adding:
          self.ref_code = self.gen_code()
     return super().save(*args, kwargs)

Use
try :
    upline = Referral.objects.get(ref_code=some_code)
except:
    upline= None

user_refferal = Referral(user=user, upline=upline)
user_refferal.save()

Hope this helps!!!