如何在detailview（Django）中仅在ManytoManyfield上设置order_by？

Question

I have 2 models Class and Student . One field within the Class mdel has a ManytoManyField relationship with Student . I want to order the manytomanyfield with first_name in the template. How can I do it?

models.py

class Student(models.Model):
    user = models.OneToOneField(CustomUser, on_delete=models.CASCADE, primary_key=True)
    first_name = models.CharField(max_length=100)


class Class(models.Model):
    student = models.ManyToManyField(Student)
    subject = models.CharField(max_length=150, unique=True)
    # many other fields

views.py

class Class_detailView(LoginRequiredMixin, DetailView):
    login_url = '/'
    model = Class
    template_name = "attendance/content/teacher/class_detail.html

template

<div class="row ml-auto mr-auto">
  <h6>{{ object.subject }}</h6>
  {% for student in object.student.all %}
    <h6 id="class-detail-text" class="mt-2">
      {{student.first_name}} <-- want to order here
    </h6>
  {% endfor %}
</div>

right now the names render like this:

Freaky  Albon  Bucky

I want it to order like this:

Albon   Bucky  Freaky

Answer 1

Set ordering in the model meta

class Student(models.Model):
    user = models.OneToOneField(CustomUser, on_delete=models.CASCADE, primary_key=True)
    first_name = models.CharField(max_length=100)

    

Answer 2

You can just override the queryset attribute of your view. You can also use the Meta attribute of the Student model if you always want the ordering to take place any time you access it.

from django.db.models import Prefetch

class Class_detailView(LoginRequiredMixin, DetailView):
    queryset = Class.objects.prefetch_related(Prefetch('student', queryset=Student.objects.order_by('name'))
    login_url = '/'
    model = Class
    template_name = "attendance/content/teacher/class_detail.html

See docs on prefetch_related : https://docs.djangoproject.com/en/3.1/ref/models/querysets/#prefetch-related

As an aside, usually ManyToManyField 's are pluralized, so consider changing it to students .