Django：QuerySet过滤器无法正常工作

Question

我有以下QuerySet。

from myapp.events.models import Event
from myapp.surveys import QuestionFocus
from django.conf import settings

event = Event.objects.get(pk=12)
survey = event.surveys.get(
    template=settings.SURVEY_POST_EVENT
).questions.filter(
    focus=QuestionFocus.RECOMMENDATION_TO_FRIENDS,
    answers__answer="9"
).prefetch_related("answers")

survey.first().answers.all()

现在我只希望有两个答案（9）。但是，我的过滤器请求完全被忽略了。看到我做错了吗？

>>> <QuerySet [Answer: 2, Answer: 9, Answer: 9, Answer: 10]>

答案模型：

class Answer(TimeStampedModel):
    question = models.ForeignKey(
        "surveys.Question", on_delete=models.CASCADE, related_name="answers"
    )
    response = models.ForeignKey(
        "Response", on_delete=models.CASCADE, related_name="answers"
    )
    answer = models.TextField(verbose_name=_("Answer"))
    choices = models.ManyToManyField(
        "surveys.AnswerOption", related_name="answers", blank=True
    )

Answer 1

您的answers__answer="9"过滤器运行正常；如果您具有这种关系，它将仅显示包含Question且具有answers字段answer的9实例。