text: from django.contrib import admin
  from ordered_model.admin import OrderedModelAdmin
  
  from .models import Sponsor, SponsorLevel
  
  
  @admin.register(Sponsor)
  class SponsorAdmin(OrderedModelAdmin):
      list_display = ("name", "move_up_down_links")
      list_filter = (
          "levels__conference",
          "levels__name",
      )
      readonly_fields = ("order",)
  
  
  @admin.register(SponsorLevel)
  class SponsorLevelAdmin(OrderedModelAdmin):
      list_display = ("name", "conference", "move_up_down_links")
      readonly_fields = ("order",)
  