old_contents: from django.db import models
  from django.template.loader import render_to_string
  
  from normandy.recipes.models import Recipe
  
  
  class Extension(models.Model):
      name = models.CharField(max_length=255)
      xpi = models.FileField(upload_to='extensions')
  
      @property
      def recipes_used_by(self):
          """Set of enabled recipes that are using this extension."""
          return Recipe.objects.filter(
              latest_revision__arguments_json__contains=self.xpi.url,
          )
  
      def recipes_used_by_html(self):
          return render_to_string('admin/field_recipe_list.html', {
              'recipes': self.recipes_used_by.order_by('latest_revision__name'),
          })
      recipes_used_by_html.short_description = 'Used in Recipes'
  
new_contents: from django.db import models
  from django.template.loader import render_to_string
  
  from normandy.recipes.models import Recipe
  
  
  class Extension(models.Model):
      name = models.CharField(max_length=255)
      xpi = models.FileField(upload_to='extensions')
  
      class Meta:
          ordering = ('-id',)
  
      @property
      def recipes_used_by(self):
          """Set of enabled recipes that are using this extension."""
          return Recipe.objects.filter(
              latest_revision__arguments_json__contains=self.xpi.url,
          )
  
      def recipes_used_by_html(self):
          return render_to_string('admin/field_recipe_list.html', {
              'recipes': self.recipes_used_by.order_by('latest_revision__name'),
          })
      recipes_used_by_html.short_description = 'Used in Recipes'
  
subject: Add ordering to Extension model