class User(models.Model):

username = models.Charfield()

class Topic(models.Model):

# Posted by

user = models.ForeignKey(User)

class Reply(models.Model):

topic = models.ForeignKey(Topic)

# Respondent

user = models.ForeignKey(User)

Now we need to query all the replies to posts posted by a user

user = User.objects.get(pk=5)

replies = Reply. objects.filter(topic.user.id==user.id)

Always reports an error:

SyntaxError: keyword can't be an expression

May I ask? How to deal with it so that you can get all the replies.