old_contents: from django.contrib import admin
  from main.models import Persons, Users, Groups, GroupLists, Images, Views
  
  class SubjectDashboardAdmin(admin.ModelAdmin):
      pass
  
  class PersonsAdmin(admin.ModelAdmin):
      pass
  
  class UsersAdmin(admin.ModelAdmin):
      pass
  
  class GroupsAdmin(admin.ModelAdmin):
      pass
  
  class GroupListsAdmin(admin.ModelAdmin):
      def formfield_for_foreignkey(self, db_field, request, **kwargs):
          if db_field.name == 'group_name':
              kwargs['queryset'] = Groups.objects.exclude(group_name='public')
  
      list_display = ("group_name", "friend_id")
      
  class ImagesAdmin(admin.ModelAdmin):
      pass
  
  
  # Register your models here.
  admin.site.register(Users)
  admin.site.register(Groups)
  admin.site.register(GroupLists)
  admin.site.register(Views)
  
new_contents: from django.contrib import admin
  from main.models import Persons, Users, Groups, GroupLists, Images, Views
  
  class PersonsAdmin(admin.ModelAdmin):
      pass
  
  class UsersAdmin(admin.ModelAdmin):
      pass
  
  class GroupsAdmin(admin.ModelAdmin):
      pass
  
  class GroupListsAdmin(admin.ModelAdmin):
      def formfield_for_foreignkey(self, db_field, request, **kwargs):
          if db_field.name == 'group_name':
              kwargs['queryset'] = Groups.objects.exclude(group_name='public')
  
      list_display = ("group_name", "friend_id")
      
  class ImagesAdmin(admin.ModelAdmin):
      pass
  
  
  # Register your models here.
  admin.site.register(Users)
  admin.site.register(Groups)
  admin.site.register(GroupLists)
  admin.site.register(Views)
  
subject: remove reference to SubjectDashboard