创建用户模型类型时发生FieldError

我一直在尝试定制用户模型,这样它可以有不同的角色,我被卡住了。我不知道我错过了什么或者什么时候走错了方向。我应该创造4个角色:老师、学生、家长和班主任。这是我的模型。py:

#importing modules
from django.db import models
from django.db.models.fields import proxy
from django.utils.translation import gettext_lazy as _
from django.contrib.auth.models import AbstractBaseUser, BaseUserManager, PermissionsMixin, AbstractUser
from django.utils import timezone
from class_apps.models import Classes
from class_apps.models import Subjects
from phone_field import PhoneField


####MODELS

#Managers
class UserManager(BaseUserManager):
    def _create_user(self, username, password, is_staff, is_superuser, is_active, **extra_fields):
        if not username:
            raise ValueError('Users must have an username')
        now = timezone.now()
        user = self.model(
            username=username,
            is_staff=is_staff,
            is_active=is_active,
            is_superuser=is_superuser,
            last_login=now,
            date_joined=now,
            **extra_fields
        )
        user.set_password(password)
        user.save(using=self._db)
        return user

    def create_user(self, username=None, password=None, is_active=True, **extra_fields):
        return self._create_user(username, password, False, False, is_active, **extra_fields)

    def create_superuser(self, username, password, **extra_fields):
        user = self._create_user(username, password, True, True, True, **extra_fields)
        user.save(using=self._db)
        return user
    def save(self, *args, **kwargs):
        if not self.pk:
            self.type = User.Types.STUDENT
        return super().save(*args, **kwargs)

class TeacherManager(models.Manager):
    def get_queryset(self, *args, **kwargs):
        return super().get_queryset(*args, **kwargs).filter(base_type=User.Types.TEACHER)

class StudentManager(models.Manager):
    def get_queryset(self, *args, **kwargs):
        return super().get_queryset(*args, **kwargs).filter(base_type=User.Types.STUDENT)

class ParentManager(models.Manager):
    def get_queryset(self, *args, **kwargs):
        return super().get_queryset(*args, **kwargs).filter(base_type=User.Types.PARENT)

    def create_parent(self, user, title, surname,other_names,email,phone_no,address,gender,marital_status,proposed_wards):
        parentdetails = self.create(user=user, title=title, surname=surname, other_names=other_names, email=email, phone_no=phone_no, address=address, gender=gender, marital_status=marital_status,proposed_wards=proposed_wards )
        return parentdetails

# Users_Models
class User(AbstractBaseUser, PermissionsMixin):
    'Abstract base user for all users'
    USERNAME_FIELD = 'username'
    REQUIRED_FIELDS = []

    objects = UserManager()

    class Types(models.TextChoices):
        'Class to handle different user types'
        TEACHER = "TEACHER", _("Teacher")
        STUDENT = "STUDENT", _("Student")
        PARENT = "PARENT", _("Parent")
        HEADTEACHER = "HEADTEACHER", _("HEADTEACHER")
    
    base_type = models.CharField(max_length=50, choices=Types.choices, null=True)
    
    username = models.CharField(max_length=254, null=True, blank=True,unique=True)
    is_staff = models.BooleanField(default=False)
    is_superuser = models.BooleanField(default=False)
    is_active = models.BooleanField(default=True)
    last_login = models.DateTimeField(null=True, blank=True)
    date_joined = models.DateTimeField(auto_now_add=True)

    

# Proxy_Models
class Teacher(User): 
    base_type = User.Types.TEACHER
    objects = TeacherManager()

    @property
    def more(self):
        return self.teacherdetails
    
    def save(self, *args, **kwargs):
        if not self.pk:
            self.type = self.base_type
        return super().save(*args, **kwargs)

    class Meta:
        proxy = True 

    def __str__(self):
        return f'{self.username}'

class Student(User):
    base_type = User.Types.STUDENT
    objects = StudentManager()

    @property
    def more(self):
        return self.studentdetails
    
    def save(self, *args, **kwargs):
        if not self.pk:
            self.type = self.base_type
        return super().save(*args, **kwargs)
    
    class Meta:
        proxy = True
    
    def __str__(self):
        return f'{self.username}'

class Parent(User):
    base_type = User.Types.PARENT
    objects = ParentManager()

    @property
    def more(self):
        return self.parentdetails
    
    def save(self, *args, **kwargs):
        if not self.pk:
            self.type = self.base_type
        return super().save(*args, **kwargs)
    
    class Meta:
        proxy = True
    
    def __str__(self):
        return f'{self.username}'

class HeadTeacher(User):
    base_type = User.Types.HEADTEACHER

    def save(self, *args, **kwargs):
        if not self.pk:
            self.type = self.base_type
        return super().save(*args, **kwargs)

# User_Models
class StudentDetails(models.Model):
    user = models.OneToOneField(Student, on_delete=models.CASCADE)
    image = models.ImageField(upload_to='upload/', null=True)
    Name = models.CharField(max_length=50,  help_text='Full Name', null=True)
    Class = models.ForeignKey(Classes, on_delete=models.CASCADE, null=True, blank=True)

    def __str__(self):
        return f'{self.user} {self.id}'

class TeacherDetails(models.Model):
    user = models.OneToOneField(Teacher, on_delete=models.CASCADE)
    Name = models.CharField(max_length=50,  help_text='Full Name', null=True)
    title = models.CharField(max_length=50, null=True, default=None)
    image = models.ImageField(upload_to='upload/', null=True)
    Staff_id = models.CharField(max_length=50)
    Phone_number = PhoneField(blank=True, help_text='Contact phone number')
    Bio = models.TextField(blank=True)
    Class = models.ManyToManyField(Classes)
    Subject = models.ManyToManyField(Subjects)

    def __str__(self):
        return f'{self.Name}'

class ParentDetails(models.Model):
    user = models.OneToOneField(Parent, on_delete=models.CASCADE, null=True)
    image = models.ImageField(upload_to='parent/upload/', null=True)
    title = models.TextField(null=True)
    surname = models.TextField(null=True)
    other_names = models.TextField(null=True)
    email = models.EmailField(null=True)
    phone_no = models.TextField(null=True)
    address = models.TextField(null=True)
    gender = models.TextField(null=True)
    marital_status = models.TextField(null=True)
    proposed_wards = models.TextField(null=True)
    wards = models.ManyToManyField(StudentDetails)
    objects = ParentManager()

    def __str__(self):
        return f'{self.surname}'

它不断地提出错误:

FieldError at /admin-portal/users/parentdetails/
Cannot resolve keyword 'base_type' into field. Choices are: address, email, gender, id, image, marital_status, other_names, phone_no, proposed_wards, surname, title, user, user_id, wards

#import modules
from django.contrib import admin
from django.contrib.auth.admin import UserAdmin as BaseUserAdmin
from .models import *
from class_apps.models import *

# Register your models here.
class UserAdminConfig(BaseUserAdmin):
    fieldsets = (
        (None, {'fields': ('username', 'password', 'last_login')}),
        ('Permissions', {'fields': (
            'is_active',
            'is_staff',
            'is_superuser',
            'user_permissions',
            
        )}),
    )
    add_fieldsets = (
        (
            None,
            {
                'classes': ('wide',),
                'fields': ('username', 'password1', 'password2')
            }
        ),
    )

    list_display = ('username','is_staff', 'last_login')
    list_filter = ('is_staff', 'is_superuser', 'is_active')
    search_fields = ('username',)
    ordering = ('username',)
    filter_horizontal = ('groups', 'user_permissions',)


admin.site.register(HeadTeacher, UserAdminConfig)
admin.site.register(Teacher, UserAdminConfig)
admin.site.register(Student,UserAdminConfig)
admin.site.register(Parent,UserAdminConfig)
admin.site.register(TeacherDetails)
admin.site.register(StudentDetails)
admin.site.register(ParentDetails)

#customizing admin template
admin.site.site_header = "Sacred Hearts"
admin.site.site_title = "Sacred Admin Portal"
admin.site.index_title = "Welcome to Sacred Admin Portal"

请提前帮助和感谢