Django：获取 QuerySet 中对象的偏移量

Question

我有两个模型，一个是问题文本，第二个是针对用户和特定问题的答案。我一个用户已经回答了很多问题，给定一个问题，我怎样才能找到相应答案的索引？索引表示先前答案的数量/给定答案的位置。

更具体地说，当我查询以下内容时：

from django.db import models
from django.conf import settings

class Question(models.Model):
    body = models.TextField()

class Answer(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL, models.CASCADE)
    question = models.ForeignKey(Question, models.CASCADE)
    answer = models.TextField()


def getIndexOfAnswer(user, question):
    answer = user.answer_set.filter(user=user, question=question).all().order_by("pk")
    return answer.???index()???

如何获取给定用户的答案索引（例如，按 PrimaryKey 排序）？

Answer 1

我有！

def getIndexOfAnswer(user, question):
    answer = user.answer_set.filter(question=question).get()
    return user.answer_set.filter(pk__lte=answer.pk).count() - 1