Is it possible in Django to have 2 different types of users with theirs own login fields in the same app?

Question

I have 2 types of users on my site, one is the store owner, I want to log him in with the usual custom user email and password, the other is the buyer, I want to login the buyer using just a pin number only. Is it possible to have both types of login users in the same django app. Thanks in advance.

class Store(models.Model):
store_name = models.CharField(max_length=200)
store_status = models.BooleanField()
store_details = models.CharField(max_length=300, blank = True)
store_balance = models.IntegerField(default=0)
user = models.OneToOneField(User, on_delete=models.CASCADE)
college = models.ForeignKey(Institute, on_delete=models.CASCADE )
def __str__(self):
    return str(self.store_name)+" "+ str(self.store_status)


class Customer(models.Model):
name = models.CharField(max_length=200)
branch = models.CharField(max_length=200, choices=BRANCHES)
sem = models.CharField(max_length=200, choices=SEMESTERS)
reg_no = models.IntegerField(default=0)
balance = models.IntegerField(default=0)
pin_no = models.IntegerField()
college = models.ForeignKey(Institute, on_delete=models.CASCADE )

Answer 1

To make a custom authentication you need to add an Authentication Backend. Firstly your customer model is not related to your user model try adding a OnetoOne field in that. After that try adding code like this in one of your apps:-

from django.contrib.auth.backends import BaseBackend

class MyBackend(BaseBackend):
    def authenticate(self, request, token=None):
        try:
            customer = Customer.objects.get(pin_no=token)
            user = customer.user
        except Customer.DoesNotExist:
            return None
        return user
    
    def get_user(self, user_id):
        try:
            return User.objects.get(pk=user_id)
        except User.DoesNotExist:
            return None

Refer the documentation on Customizing authentication in Django for more information.

Now after making an AuthenticationBackend you need to make it so that Django uses it, you do this by adding it to AUTHENTICATION_BACKENDS in your settings.py, since you want the default username and password to remain something like this would work:

AUTHENTICATION_BACKENDS = ['django.contrib.auth.backends.ModelBackend', 'path.to.MyBackend']