Base3 of MTV: Foreign Key

# In models.py
class Comment(models.Model):
    topic = models.ForeignKey(Topic)
    comment = models.CharField(max_length=200, null=True, blank=True, verbose_name='评论')
    date_added = models.DateTimeField(auto_now_add=True, verbose_name='创建时间')
    class Meta:
        verbose_name_plural = 'comments'
    def __str__(self):
        return self.comment[:10]
        
# In admin.py
admin.site.register(Comment)

# In views.py
def topic(request, topic_id):
    topic = Topic.objects.get(id=topic_id)
    comments = topic.comment_set.order_by('-date_added')
    context = {
        'topic': topic,
        'comments': comments
    }
    return render(request, 'examples/topic.html', context)

# In templates
<p>Comments: </p>
{% for comment in comments %}
    <li>{{ comment.comment }}</li>
{% endfor %}