how to delete an specific item from a foreign key within .views? Django

Question

Im working on a Django app where you can join events only under the approval of the owner of the event.

By now, I have the function that adds the current user to the event for approval.

.views

@login_required
def request_event(request, pk):
    previous = request.META.get('HTTP_REFERER')
    try:
        post = Post.objects.get(pk=pk)
        Attending.objects.create(post=post, attendant=request.user)
        messages.success(request, f'Request sent!')
        return redirect(previous)
    except post.DoesNotExist:
        return redirect('/')

and here is the function that deletes de user request (By now is deleting the request of the current logged user)

@login_required
def remove_attendant(request, pk):
    previous = request.META.get('HTTP_REFERER')
    try:
        post = Post.objects.get(pk=pk)
        #attendant = #post.attending_set.all
        Attending.objects.filter(post=post, attendant=request.user).delete()
        messages.success(request, f'User removed!')
        return redirect(previous)
    except post.DoesNotExist:
        return redirect('/')

My situation here is that I'm a having problem to get the attendants of the event (all the users who where added as atendant), so that the owner can reject which ever request he want.

How can I change this so that the function is going to delete a specific user of the event?

Thanks!!

Additional:

models.py

class Attending(models.Model):
    is_approved = models.BooleanField(default=False)
    attendant = models.ForeignKey(User, related_name='events_attending', on_delete=models.CASCADE, null=True)
    post = models.ForeignKey('Post', on_delete=models.CASCADE, null=True)

class Post(models.Model):
    author = models.ForeignKey(User, on_delete=models.CASCADE)

urls.py

path('post/<int:pk>/remove_attendant/', views.remove_attendant, name='remove-attendant'),

.html

{% for user in object.attending_set.all %}
                <div class="d-flex mb-3 border-top pt-3">
                      <div class="p-2 align-self-center">
                        <div class="mr-1 d-inline-block" style="height:40px; width:40px;">
                            <img class="rounded-circle img-st-user-pro" src="{{ user.attendant.profile.image.url }}">
                        </div>
                      </div>
                      <div class="p-2 align-self-center">
                        <h6 class="font-weight-bold mb-0">{{ user.attendant.first_name }}</h6>
                        <h6 class="mb-0 text-secondary">24 años</h6>
                      </div>
                      <div class="ml-auto p-2 align-self-center">
                        <a href="#" style="font-size: 14px !important;" class="btn-pre p-2 rounded text-decoration-none text-white pl-3 pr-3"><i class="pr-2 fa-solid fa-circle-check"></i>Approve</a>
                        <a href="   /post/{{ object.pk }}/attendants/{{ object.pk_attendant }}/remove-attendant/" style="font-size: 14px !important;" class="bg-white p-2 rounded text-decoration-none text-dark border pl-3 pr-3 ml-2">Reject</a>
                      </div>


                </div>
{% endfor %}