Fixed cache issue with memcached

boards/models.py

@@ -281,7 +281,8 b' class Post(models.Model):'
 
     replies = models.ManyToManyField('Post', symmetrical=False, null=True,
                                      blank=True, related_name='re+')
-    referenced_posts = models.ManyToManyField('Post', symmetrical=False, null=True,
+    referenced_posts = models.ManyToManyField('Post', symmetrical=False,
+                                              null=True,
                                      blank=True, related_name='rfp+')
 
     def __unicode__(self):
@@ -317,7 +318,6 b' class Post(models.Model):'
         if self.can_bump():
             self.bump_time = timezone.now()
 
-
     def get_last_replies(self):
         if settings.LAST_REPLIES_COUNT > 0:
             reply_count = self.get_reply_count()
@@ -325,8 +325,8 b' class Post(models.Model):'
             if reply_count > 0:
                 reply_count_to_show = min(settings.LAST_REPLIES_COUNT,
                                           reply_count)
-                last_replies = self.replies.all().order_by('pub_time')[reply_count -
-                                                  reply_count_to_show:]
+                last_replies = self.replies.all().order_by('pub_time')[
+                            reply_count - reply_count_to_show:]
 
                 return last_replies
 
@@ -336,7 +336,7 b' class Post(models.Model):'
         return self.tags.order_by('name')
 
     def get_cache_key(self):
-        return str(self.id) + str(self.last_edit_time)
+        return str(self.id) + str(self.last_edit_time.microsecond)
 
 
 class User(models.Model):