new_contents: from django.shortcuts import redirect
  from django.utils.translation import ugettext_lazy as _
  from django.core.exceptions import PermissionDenied
  from django.conf.urls import url
  from django.contrib import admin
  
  from .models import Subscription, SubscriptionItem
  
  
  class SubscriptionItemInlineAdmin(admin.StackedInline):
      model = SubscriptionItem
      raw_id_fields = ("show",)
  
  
  class SubscriptionAdmin(admin.ModelAdmin):
      inlines = [SubscriptionItemInlineAdmin]
  
  
  admin.site.register(Subscription, SubscriptionAdmin)
  
subject: Add subscription admin