Расширение модели абстрактного пользователя для двух различных типов пользователей (клиент, продавец)

models.py

 from django.contrib.auth.models import AbstractUser, BaseUserManager
 from django.db import models
 from django.utils.translation import ugettext_lazy as _


 class CustomUserManager(BaseUserManager):
"""Define a model manager for User model with no username field."""

def _create_user(self, email, password=None, **extra_fields):
    """Create and save a User with the given email and password."""
    if not email:
        raise ValueError('The given email must be set')
    email = self.normalize_email(email)
    user = self.model(email=email, **extra_fields)
    user.set_password(password)
    user.save(using=self._db)
    return user

def create_user(self, email, password=None, **extra_fields):
    extra_fields.setdefault('is_staff', False)
    extra_fields.setdefault('is_superuser', False)
    return self._create_user(email, password, **extra_fields)

def create_superuser(self, email, password=None, **extra_fields):
    """Create and save a SuperUser with the given email and password."""
    extra_fields.setdefault('is_staff', True)
    extra_fields.setdefault('is_superuser', True)

    if extra_fields.get('is_staff') is not True:
        raise ValueError('Superuser must have is_staff=True.')
    if extra_fields.get('is_superuser') is not True:
        raise ValueError('Superuser must have is_superuser=True.')

    return self._create_user(email, password, **extra_fields)




 class CustomUser(AbstractUser):
     is_customer = models.BooleanField('customer status', default=False)
     is_vendor = models.BooleanField('vendor status', default=False)


 class Customer(models.Model):
     customeruser = models.OneToOneField(CustomUser, on_delete=models.CASCADE, 
      primary_key=True)
     username = None
     email = models.EmailField(_('email address'), unique=True)
     firstname = models.CharField(max_length=200)
     lastname = models.CharField(max_length=200)
      mobileno = models.IntegerField(blank=True, null=True)

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = []

    objects = CustomUserManager()


 class Vendor(models.Model):
     vendoruser = models.OneToOneField(CustomUser, on_delete=models.CASCADE, primary_key=True)
     username = None
     email = models.EmailField(_('email address'), unique=True)
     firstname = models.CharField(max_length=200)
     lastname = models.CharField(max_length=200)
     mobileno = models.IntegerField(blank=True, null=True)

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = []

    objects = CustomUserManager()
  1. I am using the email field as main field instead of the username field to signup and login. also, in admin.py i used email as the main field. While attempting makemigrations showing error (django.core.exceptions.FieldError: Unknown field(s) (mobileno) specified for CustomUser)Is it the right way to approach?

  2. can i use django default auth login,logout,password-reset functionalities for both of these user types?

Ошибка миграции... Я бы сказал, что у вас mobileno где-то в admin.py On CustomUser ModelAdmin class.

По поводу модели пользователя. На самом деле вы сделали то, что у вас все еще одна модель пользователя (я думаю, что Django's auth не поддерживает больше) с некоторыми дополнительными данными для клиентов и поставщиков. Поэтому USERNAME_FIELD, REQUIRED_FIELDS и т.д. должны быть только на классе CustomUser и только поля, указанные для клиентов и поставщиков должны быть на этих моделях.

Итак, ваши модели должны выглядеть примерно так:

class CustomUser(AbstractUser):
    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = []
    
    username = None
    email = models.EmailField(_("email address"), unique=True)
    mobileno = models.IntegerField(blank=True, null=True)

    objects = CustomUserManager()

    def is_customer(self):
        return hasattr(self, "customer")

    def is_vendor(self):
        return hasattr(self, "vendor")



class Customer(models.Model):
    user = models.OneToOneField(CustomUser, on_delete=models.CASCADE, 
    primary_key=True)
    customer_number = models.CharField(max_length=32)  # just some customer specific field
    

class Vendor(models.Model):
    user = models.OneToOneField(CustomUser, on_delete=models.CASCADE, primary_key=True)
    vendor_number = models.CharField(max_length=32)  # just some vendor specific field

И вы можете добавить методы create_customer и create_vendor к менеджеру:

class CustomUserManager(BaseUserManager):
    """Define a model manager for User model with no username field."""

    def _create_user(self, email, password=None, **extra_fields):
        """Create and save a User with the given email and password."""
        if not email:
            raise ValueError('The given email must be set')
        email = self.normalize_email(email)
        user = self.model(email=email, **extra_fields)
        user.set_password(password)
        user.save(using=self._db)
        return user

    def create_user(self, email, password=None, **extra_fields):
        extra_fields.setdefault('is_staff', False)
        extra_fields.setdefault('is_superuser', False)
        return self._create_user(email, password, **extra_fields)

    def create_superuser(self, email, password=None, **extra_fields):
        """Create and save a SuperUser with the given email and password."""
        extra_fields.setdefault('is_staff', True)
        extra_fields.setdefault('is_superuser', True)

        if extra_fields.get('is_staff') is not True:
            raise ValueError('Superuser must have is_staff=True.')
        if extra_fields.get('is_superuser') is not True:
            raise ValueError('Superuser must have is_superuser=True.')

        return self._create_user(email, password, **extra_fields)
    
    def create_customer(self, email, password=None, customer_number, **extra_fields):
        user = self.create_user(email, password, **extra_fields)
        Customer.objects.create(user=user, customer_number=customer_number)
        return user
    
    def create_vendor(self, email, password=None, vendor_number, **extra_fields):
        user = self.create_user(email, password, **extra_fields)
        Vendor.objects.create(user=user, vendor_number=vendor_number)
        return user

Вы можете прочитать об этом в документации Django https://docs.djangoproject.com/en/3.2/topics/auth/customizing/#extending-the-existing-user-model

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