boards/models.py

from django.db import models
from django.utils import timezone
from django.conf import settings

class BoardManager(models.Manager):
    def create_thread(self, board):
	thread = self.create(board=board, posts=0, pub_date=timezone.now())

	return thread

    def create_post(self, title, text, thread, image):
	post = self.create(title=title, text=text, pub_date=timezone.now(),
		thread=thread, image=image, poster_ip='0.0.0.0',
		poster_user_agent='')
	thread.posts = thread.posts + 1

	return post

    def delete_post(self, post):
	thread = post.thread
	post.delete()
	thread.posts = thread.posts - 1

	if (thread.is_empty):
	    thread.delete()
    
    def delete_posts_by_ip(self, ip):
	posts = self.filter(poster_ip=ip)
	for post in posts:
	    self.delete_post(post)

class Board(models.Model):
    name = models.CharField(max_length=10)
    description = models.CharField(max_length=50)

    def __unicode__(self):
	return self.name

class Thread(models.Model):
    objects = BoardManager()

    board = models.ForeignKey(Board)
    posts = models.IntegerField()
    pub_date = models.DateTimeField()

    def __unicode__(self):
	return str(self.id)

    def is_dead(self):
	return self.posts >= settings.MAX_POSTS_PER_THREAD

    def is_empty(self):
	return self.posts == 0

class Post(models.Model):
    objects = BoardManager()

    title = models.CharField(max_length=100)
    pub_date = models.DateTimeField()
    text = models.TextField()
    thread = models.ForeignKey(Thread)
    image = models.ImageField(upload_to='images/src/')
    poster_ip = models.IPAddressField()
    poster_user_agent = models.TextField()

    def __unicode__(self):
	return self.title + ' (' + self.text + ')'