old_contents: import os
  
  from django.contrib.auth.models import User
  from django.db import models
  from django.template.defaultfilters import date, time
  
  
  class Discussion(models.Model):
      user = models.ForeignKey(User)
      name = models.CharField(max_length=255)
      slug = models.SlugField()
      image = models.ImageField(upload_to='images/discussions', max_length=255, blank=True, null=True)
      description = models.TextField(default='', blank=True, null=True)
  
      def __unicode__(self):
          return self.name
  
      @models.permalink
      def get_absolute_url(self):
          return ('discussion', [self.slug])
  
  
  class Post(models.Model):
      discussion = models.ForeignKey(Discussion)
      user = models.ForeignKey(User)
      body = models.TextField()
      attachment = models.FileField(upload_to='uploads/posts', blank=True, null=True)
      time = models.DateTimeField(auto_now_add=True)
  
      def __unicode__(self):
          return 'Post by {user} at {time} on {date}'.format(
              user=self.user,
              time=time(self.time),
              date=date(self.time),
          )
  
      @models.permalink
      def get_absolute_url(self):
          return ('discussion_post', [self.discussion.slug, str(self.id)])
  
      @property
      def attachment_filename(self):
          return self.attachment and os.path.basename(self.attachment.name)
  
      @property
      def prefix(self):
          return 'post-%d' % (self.pk or 0,)
  
  
  class Comment(models.Model):
      post = models.ForeignKey(Post)
      user = models.ForeignKey(User)
      body = models.TextField()
      attachment = models.FileField(upload_to='uploads/comments',
                                      blank=True, null=True)
      time = models.DateTimeField(auto_now_add=True)
  
      @property
      def attachment_filename(self):
          return self.attachment and os.path.basename(self.attachment.name)
  
      class Meta:
          ordering = ('time',)
  
      def __unicode__(self):
          return 'Comment by {user} at {time} on {date}'.format(
              user=self.user,
              time=time(self.time),
              date=date(self.time),
          )
  
new_contents: import os
  
  from django.contrib.auth.models import User
  from django.db import models
  from django.template.defaultfilters import date, time
  
  
  class Discussion(models.Model):
      user = models.ForeignKey(User)
      name = models.CharField(max_length=255)
      slug = models.SlugField()
      image = models.ImageField(upload_to='images/discussions', max_length=255, blank=True, null=True)
      description = models.TextField(default='', blank=True, null=True)
  
      def __unicode__(self):
          return self.name
  
      @models.permalink
      def get_absolute_url(self):
          return ('discussion', [self.slug])
  
  
  class Post(models.Model):
      discussion = models.ForeignKey(Discussion)
      user = models.ForeignKey(User)
      body = models.TextField()
      attachment = models.FileField(upload_to='uploads/posts', blank=True, null=True)
      time = models.DateTimeField(auto_now_add=True)
  
      class Meta:
          ordering = ('-time',)
  
      def __unicode__(self):
          return 'Post by {user} at {time} on {date}'.format(
              user=self.user,
              time=time(self.time),
              date=date(self.time),
          )
  
      @models.permalink
      def get_absolute_url(self):
          return ('discussion_post', [self.discussion.slug, str(self.id)])
  
      @property
      def attachment_filename(self):
          return self.attachment and os.path.basename(self.attachment.name)
  
      @property
      def prefix(self):
          return 'post-%d' % (self.pk or 0,)
  
  
  class Comment(models.Model):
      post = models.ForeignKey(Post)
      user = models.ForeignKey(User)
      body = models.TextField()
      attachment = models.FileField(upload_to='uploads/comments',
                                      blank=True, null=True)
      time = models.DateTimeField(auto_now_add=True)
  
      @property
      def attachment_filename(self):
          return self.attachment and os.path.basename(self.attachment.name)
  
      class Meta:
          ordering = ('time',)
  
      def __unicode__(self):
          return 'Comment by {user} at {time} on {date}'.format(
              user=self.user,
              time=time(self.time),
              date=date(self.time),
          )
  
subject: Order Posts by latest first.