old_contents: from django.db import models
  from django.contrib.sites.models import Site
  
  
  class DatedModel(models.Model):
      created_time = models.DateTimeField(auto_now_add=True, null=True)
      updated_time = models.DateTimeField(auto_now=True, null=True)
  
      class Meta:
          abstract = True
          get_latest_by = 'updated_time'
  
  
  class SiteInfo(models.Model):
      site = models.OneToOneField(Site, primary_key=True)
      description = models.TextField(null=True)
  
      def __unicode__(self):
          return unicode(self.site)
  
      class Meta:
          verbose_name_plural = 'site info'
  
new_contents: from django.db import models
  from django.contrib.sites.models import Site
  
  
  class DatedModel(models.Model):
      created_time = models.DateTimeField(auto_now_add=True, null=True)
      updated_time = models.DateTimeField(auto_now=True, null=True)
  
      class Meta:
          abstract = True
          get_latest_by = 'updated_time'
  
  
  class SiteInfo(models.Model):
      site = models.OneToOneField(Site, primary_key=True)
      description = models.TextField(null=True)
  
      def __unicode__(self):
          return unicode(self.site)
  
      class Meta:
          verbose_name_plural = 'site info'
  
      def save(self, *args, **kwargs):
          # Ensure the site cache is cleared so the new
          # info will be loaded next time
          rc = super(SiteInfo, self).save(*args, **kwargs)
          Site.objects.clear_cache()
          return rc
  
subject: Clear sites cache on SiteInfo save