Python-сообщество

class Post(models.Model):
    title = models.CharField(max_length=128)
    text = models.TextField()
    public = models.BooleanField(default=False)
    class Meta:
        ordering = ["title"]
    def __unicode__(self):
        return self.title
class Image(models.Model):
    post = models.ForeignKey(Post)
    image = models.ImageField(upload_to='images')

def _get_upload_to(instance, filename):
    return u'images/%s/%s' % (instance.post.id, filename)
class Image(models.Model):
    post = models.ForeignKey(Post)
    image = models.ImageField(upload_to=get_upload_to)