old_contents: # coding: utf-8
  from django.contrib import admin
  from .models import Report
  
  class ReportAdmin(admin.ModelAdmin):
      list_display = ('addressed_to', 'reported_from', 'content', 'signed_from', 'get_copies', 'created_at')
      list_filter = ['created_at', 'content']
      search_fields = ['addressed_to', 'reported_from__username', 'content', 'signed_from']
  
  admin.site.register(Report, ReportAdmin)
  
new_contents: # coding: utf-8
  from django.contrib import admin
  from .models import Report
  
  class ReportAdmin(admin.ModelAdmin):
      list_display = ('addressed_to', 'reported_from', 'signed_from', 'created_at')
      list_filter = ['created_at']
      search_fields = ['addressed_to', 'reported_from__username', 'content', 'signed_from']
  
  admin.site.register(Report, ReportAdmin)
  
subject: Change search and list fields