CREATE Model

Hi.. I was given this description on which i have to design model

• You have to design a user model in Django. You need to consider following use cases 

Organization has multiple user type 

1. Organization's own employees
2. Brands which do marketing on organization 
3. Developers 
4. End user.

• Now each of above users is firstly a organization's user. There are hierarchy in the brand (Every level has a different permission level)

1. Owner 
2. Manager 
3. Associate

• There are hierarchy in Organization itself organisation (Every level has a different permission level)

1. CEO
2. VP 
3. Director
4. Moderator

• Consider these cases you have to design database schema so that
  

1. Any user can be an owner of n number of brand
2. One brand can have n number of owner.
3. There could be n number VP in organization.

So i build this model structure..

from django.conf import settings
from django.db import models
from django.contrib.auth.models import AbstractUser
from django.db.models.signals import post_save


from brands.models import Brand




class UserType(models.Model):
    EMPLOYEE = 1
    BRAND = 2
    DEVELOPER = 3


    USER_TYPE = (
        (EMPLOYEE, "Employee"),
        (BRAND, "Brand"),
        (DEVELOPER, "Developer"),
    )


    id = models.PositiveSmallIntegerField(primary_key=True, choices=USER_TYPE)


    def __str__(self):
        return self.get_id_display()




class CustomUser(AbstractUser):
    user_type = models.ManyToManyField(UserType)
    verified = models.BooleanField(default=False)




class BrandUser(models.Model):
    user = models.OneToOneField(settings.AUTH_USER_MODEL,
                                on_delete=models.CASCADE)
    brands = models.ManyToManyField(Brand, through="BrandPosition")


    def __str__(self):
        return self.user.username




class BrandPosition(models.Model):
    OWNER = 1
    MANAGER = 2
    ASSOCIATE = 3


    ROLE = (
        (OWNER, "Owner"),
        (MANAGER, "Manager"),
        (ASSOCIATE, "Associate")
    )


    user = models.ForeignKey(BrandUser,
                             on_delete=models.CASCADE)
    brand = models.ForeignKey(Brand, on_delete=models.CASCADE)
    position = models.PositiveSmallIntegerField(choices=ROLE)


    class Meta:
        unique_together = "user", "brand", "position",


    def __str__(self):
        return "{} as {} in {}".format(self.user.user.username,
                                       self.get_position_display(),
                                       self.brand.name)




class EmployeePosition(models.Model):
    CEO = 1
    VP = 2
    DIRECTOR = 3
    MODERATOR = 4


    POSITIONS = (
        (CEO, "CEO"),
        (VP, "VP"),
        (DIRECTOR, "Director"),
        (MODERATOR, "Moderator"),
    )


    id = models.PositiveSmallIntegerField(primary_key=True, choices=POSITIONS)


    def __str__(self):
        return self.get_id_display()




class EmployeeUser(models.Model):
    user = models.OneToOneField(settings.AUTH_USER_MODEL,
                                on_delete=models.CASCADE)
    position = models.ManyToManyField(EmployeePosition)




class DeveloperUser(models.Model):
    pass

Does it match the description or there's something missing??

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