def end_datetime(self):

        return datetime.datetime(

            self.day.date.year,

            self.day.date.month,

            self.day.date.day,

            self.end.hour,

            self.end.minute)

    @property

    def length_in_minutes(self):

        return int(

            (self.end_datetime - self.start_datetime).total_seconds() / 60)

    @property

    def rooms(self):

        return Room.objects.filter(pk__in=self.slotroom_set.values("room"))

    def save(self, *args, **kwargs):

        roomlist = ' '.join(map(str, self.rooms))

        self.name = "%s %s (%s - %s) %s" % (self.day.date, self.kind.label, self.start, self.end, roomlist)

        self.content_override_html = parse(self.content_override)

        super(Slot, self).save(*args, **kwargs)

    def __str__(self):

    class SymposionMeta:

        select_related = ('kind__schedule__section', 'day')

    class Meta:

        ordering = ["day", "start", "end"]

        verbose_name = _("slot")

        verbose_name_plural = _("slots")

class SlotRoom(models.Model):

    """

    Links a slot with a room.

    """

    slot = models.ForeignKey(Slot, verbose_name=_("Slot"))

    room = models.ForeignKey(Room, verbose_name=_("Room"))

    def __str__(self):

        return "%s %s" % (self.room, self.slot)

    class Meta:

        unique_together = [("slot", "room")]

        ordering = ["slot", "room__order"]