class User(AbstractBaseUser, PermissionsMixin):

   mobile = models.CharField(max_length=15,unique=True)
   email = models.EmailField(unique=True)
   first_name = models.CharField(max_length=30)
   last_name = models.CharField(max_length=30,blank=True)
   date_joined = models.DateTimeField(auto_now_add=True)
   is_on_booking = models.BooleanField(default=False)
   is_acitve = models.BooleanField(default=True)
   is_staff = models.BooleanField(default=False)
   is_superuser = models.BooleanField(default=False)
   bookings_count = models.IntegerField(default=0)
   GENDER_TYPES = (('male','m'),('female','f'),('other','o'))

   gender = models.CharField(max_length=15,choices=GENDER_TYPES,blank=True)

   objects = MyUserManager()

   USERNAME_FIELD = 'mobile'
   REQUIRED_FIELDS = ['email','first_name']

class MyUserManager(BaseUserManager):

   def _create_user(self, mobile, email, first_name, is_staff, is_superuser, password, **extra_fields):
       if not mobile:
           raise ValueError('User must give a mobile Number')
       email = self.normalize_email(email)
       user = self.model(mobile=mobile,email=email,first_name=first_name, is_staff=is_staff, is_superuser=is_superuser, **extra_fields)
       user.set_password(password)
       user.save(using=self._db)
       return user

   def create_user(self, mobile, password=None, email=None, first_name=None, **extra_fields):
       return self._create_user(mobile, email, first_name, False, False, password, **extra_fields)

   def create_superuser(self, mobile, email, first_name, password, **extra_fields):
       return self._create_user(mobile, email, first_name, True, True, password, **extra_fields)

{
  "non_field_errors": [
    "Unable to log in with provided credentials."
  ]
}