old_contents: from django.contrib import admin
  
  # Register your models here.
  
new_contents: from django.contrib import admin
  from .models import *
  
  @admin.register(Preference)
  class PreferenceAdmin(admin.ModelAdmin):
     list_display=('id', 'name', 'parent', 'enabled', 'lmb', 'lmd')
  
subject: Add the preference admin