如何在django中创建2级管理员用户，其中每个用户只管理他创建的用户？

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

class CustomUser(AbstractUser):
    manager = models.ForeignKey('self', on_delete=models.CASCADE, null=True, blank=True)

AUTH_USER_MODEL = 'your_app.CustomUser'

from django.contrib.auth.models import UserManager

class CustomUserManager(UserManager):
    def get_queryset(self):
        queryset = super().get_queryset()
        if not self.request.user.is_superuser:
            queryset = queryset.filter(manager=self.request.user)
        return queryset

from django.contrib.auth.decorators import login_required
from django.shortcuts import render
from your_app.models import CustomUser

@login_required
def user_list(request):
    users = CustomUser.objects.all()
    return render(request, 'user_list.html', {'users': users})

from django import forms
from your_app.models import CustomUser

class UserCreationForm(forms.ModelForm):
    class Meta:
        model = CustomUser
        fields = ['username', 'password', 'manager']
        widgets = {'manager': forms.HiddenInput()}
    
    def __init__(self, *args, **kwargs):
        self.request = kwargs.pop('request')
        super().__init__(*args, **kwargs)
        self.fields['manager'].initial = self.request.user

from django.contrib.auth.decorators import login_required
from django.shortcuts import render, redirect
from your_app.forms import UserCreationForm

@login_required
def create_user(request):
    if request.method == 'POST':
        form = UserCreationForm(request.POST, request=request)
        if form.is_valid():
            form.save()
            return redirect('user_list')
    else:
        form = UserCreationForm(request=request)
    return render(request, 'create_user.html', {'form': form})