text: from django.contrib import admin
  from open_course.models import Classroom, Teacher, Assistant, Supporter
  # Register your models here.
  from rest_framework.authtoken.admin import TokenAdmin
  
  TokenAdmin.raw_id_fields = ('user',)
  
  admin.site.register(Classroom)
  admin.site.register(Teacher)
  admin.site.register(Assistant)
  admin.site.register(Supporter)
  