Why is diango doing an insert instead of an update on a form?

Question

Django

Hello.
The view creates a record and you can immediately edit it through the form.
But after the form button, a new record is created instead of update:

def oper_next(request, oper_id_op, template_name="stage/otk_new.html"):  
    Op1 = Oper.objects.get(id_op = oper_id_op)  #Ok! получить объект..
    otk = Otk.objects.create( id_op = Op1,   techn_oper=Op1.techn_oper, 
          prod=Op1.prod, sostav=Op1.sostav, ispoln=Op1.ispoln, smena=Op1.smena, kolwo = Op1.kolwo,)
    if request.method == 'POST':
        f = EditOtkForm(request.POST, instance=otk) 
        if f.is_valid():
            f.save()
            return HttpResponseRedirect(reverse('oper')) 
    else:
        f = EditOtkForm(instance=otk) #

    ctx = {'otk': otk,'form': f, 'oper': Op1}
    return render(request, template_name, ctx)

already explicitly stated in the form:

class EditOperForm(OperForm):

    def save(self):
        oper = self.instance
        oper.save( force_insert=False, force_update = True ) # не добавлять, замещать
        return oper

sample:

{% extends "base_generic.html" %}

{% block content %}
  <a href="{% url 'stage_index' %}"> --- на Главную --- </a>

  <h3> НОВАЯ Запись в Журнал  </h3>  
  
  <p><strong>Запись провел:</strong> {{ otk.posted_by }} {{ otk.created_on }}</p>  
  <p><strong>(от техн.зад.)</strong> {{ oper.id_op }}</p> 

  <p><strong>Продукт:</strong> {{ otk.prod }}</p> <!--  -->
  <p><strong>Статус записи:</strong> {{ otk.status }}</p> 

======= <strong> отредактируйте необходимые поля внизу </strong> =============
    <h3> Редактирование записи:</h3> 
    <form method="POST" class="post-form">{% csrf_token %}
        {{ form.as_p }}
        <button type="submit" class="save btn btn-default">Сохранить изменения</button>
    </form>
{% endblock %}

It still adds.
And the best part is that something like this works in the same project, but this one doesn't.
Has anyone come across something like this?

Answer 1

Otk.objects.create just creates a record, then I edit it in the form
and, logically, the form should have an update on the existing record
An, no! What I didn’t try :(
Instead of create(), get_or_create() is needed here!!!
only after it the object must be pulled out of the cotreh, where it will be the 1st element

Answer 2

You have Otk.objects.create two lines above the form.save call. Maybe it's in him?

Answer 3

Look at generics and switch to CBV.