Python-сообщество

class Item(models.Model):
    name = models.CharField(_('Name'), max_length=200)
    points = models.IntegerField(_('Points'), default=0)
    cluster = models.ForeignKey(Cluster, verbose_name=_('Cluster'))
    costumerservice = models.BooleanField(_('Customer Service'), blank=True, default=False)
    
    class Meta:
        verbose_name = _('Item')
        verbose_name_plural = _('Items')
        
    def __unicode__(self):
        return u'%s (%d points)' % (self.name, self.points)

class Report(models.Model):
    user = models.ForeignKey(User)
    date = models.DateTimeField(_('Date'), default=datetime.now())
    country = models.ForeignKey(Country)
    publication = models.BooleanField(_('Publication'), blank=True, default=False)
    total = models.IntegerField(default=0)
    
    class Meta:
        verbose_name = _('Report')
        verbose_name_plural = _('Reports')

    def cluster_name(self):
        return self.country.cluster
        
    def __unicode__(self):
        return self.country.country
        
    def save(self, *args, **kwargs):
        self.total = 0
        for report_item in ReportItem.objects.filter(report=self):
            self.total += report_item.item.points * report_item.total
        reports = Report.objects.filter(country=self.country, publication=True).all()
        super(Report, self).save(*args, **kwargs)


class ReportItem(models.Model):
    item = models.ForeignKey(Item)
    total = models.IntegerField(default=0)
    report = models.ForeignKey(Report, related_name='items', verbose_name=_('Report Item'))