如何在django中创建多类型用户？

from django.contrib.auth.models import AbstractUser
from django.db import models

class User(AbstractUser):
    USER_TYPE_CHOICES = (
        ('A', '类型A'),
        ('B', '类型B'),
        ('C', '类型C'),
    )
    user_type = models.CharField(max_length=1, choices=USER_TYPE_CHOICES)

from django import forms
from .models import User

class UserRegistrationForm(forms.ModelForm):
    class Meta:
        model = User
        fields = ('username', 'password', 'user_type')

from django.shortcuts import render, redirect
from .forms import UserRegistrationForm

def register(request):
    if request.method == 'POST':
        form = UserRegistrationForm(request.POST)
        if form.is_valid():
            user = form.save(commit=False)
            # 根据用户选择的用户类型设置相应的字段值
            if user.user_type == 'A':
                # 处理类型A用户的逻辑
                pass
            elif user.user_type == 'B':
                # 处理类型B用户的逻辑
                pass
            elif user.user_type == 'C':
                # 处理类型C用户的逻辑
                pass
            user.save()
            return redirect('home')
    else:
        form = UserRegistrationForm()
    return render(request, 'registration/register.html', {'form': form})