class Thread(models.Model):
    class Meta:
        get_latest_by = "post_date"

    author = models.ForeignKey(Player, related_name="threads")
    post_date = models.DateTimeField()
    parent = models.ForeignKey(Subsection, related_name="children")
    close_note = models.ForeignKey(Note, null=True, blank=True)
    sticky = models.BooleanField()
    page_views = models.IntegerField(default=0)
    def __str__(self):
        return util.plaintext(self.title)
    def to_url(self):
        return str(self.id)
    @property
    def title(self):
        try:
            return self.children.order_by("post_date")[0].title
        except IndexError:
            return ""
class Post(models.Model):
    class Meta:
        get_latest_by = "post_date"
    title = models.CharField(max_length=max_title_length)
    author = models.ForeignKey(Player, related_name="posts")
    parent = models.ForeignKey(Thread, related_name="children")
    post_date = models.DateTimeField()
    last_edit_date = models.DateTimeField(blank=True, null=True)
    text = models.TextField(max_length=max_post_length)
    flag_note = models.ForeignKey(Note, blank=True, null=True)
    objects = PostManager()
    def __str__(self):
        return util.plaintext(self.text)[:10]
    def to_url(self):
        return str(self.id)
    @classmethod
    def create(cls, title=None, text=None, author=None,
               parent_id=None, post_date=None):
        parent = Thread.objects.get(id=parent_id)
        if post_date is None:
            post_date = datetime.now()
        return cls(title=title, author=author, parent=parent,
                    post_date=post_date, text=text, flag_note=None)