Custom Users and ios django questions

Hi everyone,

I am newbie in django so i'm a bit confused on some  features. I have to do a project for university. It consists in a desktop-web app where employees can do some staff like handle files, recording files, uploading files on a mysql database, and an ios native app (written in objective c) where a user can register himself, log in and ask for the data that the employees have saved early. 

First of all:  It's possible to do a server app that communicates with an ios app (sending-recieve data, notifications) using django-frameworks (and i suppose also django-rest-framework)? If yes, do you have some tutorials/guide/book to suggest to understand better how this communication work and how i can really do this thing?

My second question is related to Custumizing Users on Django.

For my project i need two classes of user:

- Employee (with registration_id as primary key): this user can only log in on desktop-app

- Driver : this user can only log in  on ios-app

can i have multiple custom users, for instance :

class Employees(AbstractBaseUser):

registration_id = models.IntegerField(max_length=10,unique=True, null=True, blank=True)
    first_name = models.CharField(max_length=30, null=True, blank=True)

last_name = models.CharField(max_length=60, null=True, blank=True)
        #etc etc etc

class Driver(AbstractBaseUser):
       license_plate =....
       first_name = ....
       #etc etc etc

is that reasonable?

Sorry for my bad English.

I will appeciate any kind of help

Thank you

Cheers

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