old_contents: from django.contrib import admin
  from django.template.defaultfilters import date as _date, time as _time
  from django.utils.translation import ugettext_lazy as _
  
  from models import Ticket, TicketComment
  
  
  class TicketCommentInline(admin.StackedInline):
      model = TicketComment
      extra = 1
      raw_id_fields = ['author']
      readonly_fields = ['date']
  
      def formfield_for_foreignkey(self, db_field, request, **kwargs):
          if db_field.name == 'author':
              kwargs['initial'] = request.user.id
          return super(TicketCommentInline, self).formfield_for_foreignkey(db_field, request, **kwargs)
  
  
  class TicketAdmin(admin.ModelAdmin):
      list_display = ['date', 'status', 'subject', 'creator', 'assignee', 'latest_activity', 'is_answered']
      list_filter = ['status', 'date']
      search_fields = ['subject', 'description', 'creator__username', 'creator__email']
      raw_id_fields = ['creator', 'assignee']
      inlines = [TicketCommentInline, ]
  
      def latest_activity(self, obj):
          latest = obj.get_latest_comment()
          return "%s %s - %s" % (_date(latest.date), _time(latest.date), latest.author)
      latest_activity.short_description = _("Latest activity")
  
  admin.site.register(Ticket, TicketAdmin)
  
new_contents: from django.contrib import admin
  from django.template.defaultfilters import date as _date, time as _time
  from django.utils.translation import ugettext_lazy as _
  
  from models import Ticket, TicketComment
  
  
  class TicketCommentInline(admin.TabularInline):
      model = TicketComment
      extra = 1
      raw_id_fields = ['author']
      readonly_fields = ['date']
  
      def formfield_for_foreignkey(self, db_field, request, **kwargs):
          if db_field.name == 'author':
              kwargs['initial'] = request.user.id
          return super(TicketCommentInline, self).formfield_for_foreignkey(db_field, request, **kwargs)
  
  
  class TicketAdmin(admin.ModelAdmin):
      list_display = ['date', 'status', 'subject', 'creator', 'assignee', 'latest_activity', 'is_answered']
      list_filter = ['status', 'date']
      search_fields = ['subject', 'description', 'creator__username', 'creator__email']
      raw_id_fields = ['creator', 'assignee']
      inlines = [TicketCommentInline, ]
  
      def latest_activity(self, obj):
          latest = obj.get_latest_comment()
          return "%s %s - %s" % (_date(latest.date), _time(latest.date), latest.author)
      latest_activity.short_description = _("Latest activity")
  
  admin.site.register(Ticket, TicketAdmin)
  
subject: use TabularInline