old_contents: from .models import Idea, Outstanding
  from django.contrib import admin
  from django.contrib.admin import AdminSite
  from django.contrib.auth.models import User, Group
  
  
  class MyAdminSite(AdminSite):
      site_header = "Hackatrix Backend"
      site_title = "Hackatrix Backend"
      index_title = "Administrator"
  
  
  class IdeaAdmin(admin.ModelAdmin):
      list_display = ('name', 'votes', 'description', 'register', 'is_active')
  
      def save_model(self, request, obj, form, change):
          if getattr(obj, 'register', None) is None:
              obj.register = request.user
          obj.save()
  
  
  class OutstandingAdmin(admin.ModelAdmin):
      list_display = ('name', 'email', 'comment', 'register')
  
      def save_model(self, request, obj, form, change):
          if getattr(obj, 'register', None) is None:
              obj.register = request.user
          obj.save()
  
  
  admin_site = MyAdminSite(name='myadmin')
  admin_site.register(User)
  admin_site.register(Group)
  admin_site.register(Idea, IdeaAdmin)
  admin_site.register(Outstanding, OutstandingAdmin)
  
new_contents: from .models import Idea, Outstanding
  from django.contrib import admin
  from django.contrib.admin import AdminSite
  from django.contrib.auth.admin import UserAdmin, GroupAdmin
  from django.contrib.auth.models import User, Group
  
  
  class MyAdminSite(AdminSite):
      site_header = "Hackatrix Backend"
      site_title = "Hackatrix Backend"
      index_title = "Administrator"
  
  
  class IdeaAdmin(admin.ModelAdmin):
      list_display = ('name', 'votes', 'description', 'register', 'is_active')
  
      def save_model(self, request, obj, form, change):
          if getattr(obj, 'register', None) is None:
              obj.register = request.user
          obj.save()
  
  
  class OutstandingAdmin(admin.ModelAdmin):
      list_display = ('name', 'email', 'comment', 'register')
  
      def save_model(self, request, obj, form, change):
          if getattr(obj, 'register', None) is None:
              obj.register = request.user
          obj.save()
  
  
  admin_site = MyAdminSite(name='myadmin')
  admin_site.register(User, UserAdmin)
  admin_site.register(Group, GroupAdmin)
  admin_site.register(Idea, IdeaAdmin)
  admin_site.register(Outstanding, OutstandingAdmin)
  
subject: Add UserAdmin and GroupAdmin to custom AdminSite