old_contents: from django.core.urlresolvers import reverse
  from django.db import models
  from django.utils import timezone
  
  from core.models import AuthorModel, ImageModel
  
  from .managers import PostManager, ImageManager
  import util
  
  
  STATUS_CHOICES = [('d', 'Draft'),  ('p', 'Published'), ('w', 'Withdrawn')]
  
  
  class Post(AuthorModel):
  
      pubdate = models.DateTimeField('publication date', default=timezone.now())
      status = models.CharField(max_length=1, choices=STATUS_CHOICES)
      body = models.TextField()
      drupal_id = models.IntegerField('drupal NID', unique=True, blank=True,
                                      null=True, help_text='Node ID from the previous Drupal website (imported).')
  
      objects = PostManager()
  
      class Meta:
          ordering = ['-pubdate']
  
  
  class Image(ImageModel):
  
      image = models.ImageField(upload_to=util.get_image_path)
  
      post = models.ForeignKey(Post)
  
      objects = ImageManager()
  
      class Meta:
          ordering = ['-post__pubdate', '-created']
  
new_contents: from django.core.urlresolvers import reverse
  from django.db import models
  from django.utils import timezone
  
  from core.models import AuthorModel, ImageModel
  
  from .managers import PostManager, ImageManager
  import util
  
  
  STATUS_CHOICES = [('d', 'Draft'),  ('p', 'Published'), ('w', 'Withdrawn')]
  
  
  class Post(AuthorModel):
  
      pubdate = models.DateTimeField('publication date', default=timezone.now())
      status = models.CharField(max_length=1, choices=STATUS_CHOICES)
      body = models.TextField()
      drupal_id = models.IntegerField('drupal NID', unique=True, blank=True,
                                      null=True, help_text='Node ID from the previous Drupal website (imported).')
  
      objects = PostManager()
  
      @property
      def thumbnail(self):
          if self.image_set.published():
              return self.image_set.published()[:1].get()
  
      class Meta:
          ordering = ['-pubdate']
  
  
  class Image(ImageModel):
  
      image = models.ImageField(upload_to=util.get_image_path)
  
      post = models.ForeignKey(Post)
  
      objects = ImageManager()
  
      class Meta:
          ordering = ['-post__pubdate', '-created']
  
subject: Add property for Post thumbnail