class Topic(FAQBase):
    """A topic that a Question can belong to."""

    title = models.CharField(_(u'title'), max_length=255)
    slug = models.SlugField(_(u'slug'), unique=True, help_text=_(u'Used in \
        the URL for the topic. Must be unique.'))
    description = models.TextField(_(u'description'), blank=True,
        help_text=_(u'A short description of this topic.'))
    sites = models.ManyToManyField(Site, verbose_name=_(u'sites'),
        related_name='faq_topics')
    template_name = models.CharField(_(u'template name'), blank=True,
        max_length=255, help_text=_(u'Optional template to use for this \
            topic\'s detail page, e.g., "faq/topics/special.html". If not \
            given the standard template will be used.'))