from django.contrib.sites.managers import CurrentSiteManager

from django.contrib.sites.models import Site

from django.db import models

class AbstractArticle(models.Model):

    title = models.CharField(max_length=50)

    objects = models.Manager()

    on_site = CurrentSiteManager()

    class Meta:

        abstract = True

class SyndicatedArticle(AbstractArticle):

    sites = models.ManyToManyField(Site)

class ExclusiveArticle(AbstractArticle):

    site = models.ForeignKey(Site, models.CASCADE)

class CustomArticle(AbstractArticle):

    places_this_article_should_appear = models.ForeignKey(Site, models.CASCADE)

    objects = models.Manager()

    on_site = CurrentSiteManager("places_this_article_should_appear")