解决方案

models.py

class User(AbstractUser):    roles = models.ManyToManyField("Role")

admin.py

from django.contrib.auth.admin import UserAdmin #使用django自己的UserAdmin来注册from django.utils.translation import gettext, gettext_lazy as _from .models import Userclass UserAdmin(UserAdmin):    #重写fieldsets在admin后台加入自己新增的字段    fieldsets = (        (None, {'fields': ('username', 'password')}),        (_('Personal info'), {'fields': ('first_name', 'last_name', 'email')}),        (_('Permissions'), {'fields': ('is_active', 'is_staff', 'is_superuser',                                       'groups', 'user_permissions')}),        (_('Important dates'), {'fields': ('last_login', 'date_joined')}),        (_('Roles'), {'fields': ('roles',)}),    )admin.site.register(User, UserAdmin)