How to get topics user replied?

class Topic(models.Model):
title = models.CharField(max_length=100)
body = models.TextField(_('body'), max_length=TEXT_MAX_LENGTH)
user = models.ForeignKey(User, related_name='topic_user',
editable=False)
...

I use 'django.contrib.comments' to reply a topic. How to get topics
user replied?

Thanks.

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