我该如何用Django写这个join？

Question

看看这个django代码：

filtered = Question.objects.filter(children__marked=True).distinct()
return Question.objects.exclude(id__in=filtered)

它返回所有问题的列表，除了那些已接受（标记）答案的问题。我试着让它返回问题和投票的答案。查看此SQL联接：

SELECT * from forum_node AS questions

JOIN forum_node AS answers
ON
questions.node_type = 'question' AND
answers.node_type = 'answer' AND
answers.parent_id = questions.id

WHERE
answers.score > 0 or answers.marked

现在，如何将这个连接转换成Django？你知道吗

Answer 1

answered = Question.objects.filter(children__marked=True).distinct()
unanswered = Question.objects.exclude(id__in=answered) 
upvoted = Question.objects.filter(children__score__gt=0).distinct()
return unanswered | upvoted