您可以使用 .annotate（） 获取与每个问题相关的个答案的数量。

django.db.models中的

  import Count 
个问题= Question.objects.annotate（number_of_answers = Count（'answer'））＃注释查询集
 

这样做，每个 question 对象将具有一个额外的属性 number_of_answers 个具有与每个问题相关的个答案的数量的值>。

 问题[0]。number_of_answers＃使用 number_of_answers属性

最终代码：

import Count

def all_questions（请求）：
个问题= Question.objects.annotate（number_of_answers = Count（'answer'） ）
return render（request，'all_questions.html'，{
'questions'：questions}）


在您的模板中，您可以执行以下操作：

  {％forquestion %%} 
 {{question.number_of_answers}}＃显示与此问题相关的答案的数量
 

Hi i want to display a count of answers to my question model

my model:

class Question(models.Model):

    text = models.TextField()
    title = models.CharField(max_length=200)
    date = models.DateTimeField(default=datetime.datetime.now)
    author = models.ForeignKey(CustomUser)
    tags = models.ManyToManyField(Tags)

    def __str__(self):
        return self.title


class Answer(models.Model):

    text = models.TextField()
    date = models.DateTimeField(default=datetime.datetime.now)
    likes = models.IntegerField(default=0)
    author = models.ForeignKey(CustomUser)
    question = models.ForeignKey(Question)

my view:

def all_questions(request):

    questions = Question.objects.all()
    answers = Answer.objects.filter(question_id=questions).count()

    return render(request, 'all_questions.html', {
            'questions':questions, 'answers':answers })

Right now view displays count of all answers. How can i filter it by the Question model?

You can use .annotate() to get the count of answers associated with each question.

from django.db.models import Count
questions = Question.objects.annotate(number_of_answers=Count('answer')) # annotate the queryset

By doing this, each question object will have an extra attribute number_of_answers having the value of number of answers associated to each question.

questions[0].number_of_answers # access the number of answers associated with a question using 'number_of_answers' attribute

Final Code:

from django.db.models import Count

def all_questions(request):
    questions = Question.objects.annotate(number_of_answers=Count('answer'))
    return render(request, 'all_questions.html', {
            'questions':questions})

In your template, then you can do something like:

{% for question in questions %}
    {{question.number_of_answers}} # displays the number of answers associated with this question