Django：聚合 QuerySet 结果的更好方法

Question

我有以下代码片段。我首先尝试直接将男性/女性的计数作为注释，但我没有设法得到这些。因此我写了下面的for循环。但是，它仍然觉得这个解决方案并没有想象中的那么好。您还有其他想法如何在此处编写更好的代码吗？

genders = self.get_answers(self.get_super_guests(), QuestionFocus.GENDER)
# >>> <QuerySet [Answer: Male, Answer: Female, Answer: Male]>
male = female = 0
for gender in genders:
    if gender.answer == "Male":
        male += 1
    elif gender.answer == "Female":
        female += 1

print("Gender distribution is Male", male, "Female: ", female)

Answer 1

您可以用项目的数量注释查询集的值，例如：

result = genders.values('answer').annotate(
    number=Count('answer')
).order_by('answer')

这将导致 QuerySet 看起来像：

<QuerySet [
    { 'answer': 'Male', 'number': 14},
    { 'answer': 'Female', 'number': 25}
]>

Answer 2

# if your model name is QuestionFocus, then your query should be like this

QuestionFocus.objects.values('answer').annotate(number=Count('answer'))

Django：聚合 QuerySet 结果的更好方法

Django: Better way to aggregate QuerySet results

python

django

django-queryset