Django:如何在自定义UserAdmin中显示组字段？

from django.contrib import admin
from django.contrib.auth.admin import UserAdmin as BaseUserAdmin
from django.contrib.auth.models import Group
from django.contrib.auth.admin import GroupAdmin
from django.contrib.auth.models import User

class CustomUserAdmin(BaseUserAdmin):
    # 定义要显示的字段
    list_display = ('username', 'email', 'is_staff', 'get_groups')

    # 重写get_groups方法，用于获取用户所属的组
    def get_groups(self, obj):
        return ", ".join([group.name for group in obj.groups.all()])

    # 设置get_groups方法在后台管理界面中的显示名称
    get_groups.short_description = 'Groups'

# 注册自定义的UserAdmin类
admin.site.unregister(User)
admin.site.register(User, CustomUserAdmin)

admin.site.unregister(Group)
admin.site.register(Group, GroupAdmin)