django count of foreign key model

Question

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

my model:

class Question(models.Model):

    text = models.TextField()
    title = model         


        

Answer 1

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