解決方案
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來注冊
from django.utils.translation import gettext, gettext_lazy as _
from .models import User
class UserAdmin(UserAdmin):
#重寫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)