Updating FileField in Django Form

Question

Playing around with FileFiled and trying to update a form. I think my problem comes from the views.py.

I have a template where I can see a product, and I have the option to update the product by clicking on the update button.

When clicking on the update button, I am redirected to a form where I can update the product.

template

    {% for TermsAndConditions in commercial_list %}
            <a class="btn btn-outline-secondary" href="{% url 'update-commercial' TermsAndConditions.id %}">Update
            </a>    
    {% endfor %}

templateform.py

        <form action="" method="post" enctype="multipart/form-data">
                {% csrf_token %}

                <h6>Upload terms</h6>
        {{ form.attachment| as_crispy_field}}

            {% if url %}
            <p>Uploaded file <a href="{{url}}">{{url}}</a></p>

            {%endif%}

        <button type="submit" value="Submit" id="profile-btn" class="btn btn-primary custom-btn">Update</button>
        </form>

My normal upload form (without FileField) looks like this:

views (without FileField)

def update_commercial(request, termsandconditions_id):
    commercials = TermsAndConditions.objects.get(pk=termsandconditions_id)
    form = TermsAndConditionsForm(request.POST or None, instance=commercials )
    if form.is_valid():
        form.save()
        return redirect('list-commercial')
    return render(request, 'main/update_commercial.html',{'form':form,'commercials':commercials})

With the addition of the FileField, I thought I would do something like this:

views (with FileField)

def update_commercial(request, termsandconditions_id):
    commercials = TermsAndConditions.objects.get(pk=termsandconditions_id)
    form = TermsAndConditionsForm(request.POST or None, request.FILES ,instance=commercials ) #the change being request.FILES
    if form.is_valid():
        form.save()
        return redirect('list-commercial')
    return render(request, 'main/update_commercial.html',{'form':form,'commercials':commercials})

Problem is, when I do that the update button in the template becomes invalid (it doesn't redirect to the update form).

I think my problem is how to handle the or None and request.FILES together. I tried different combinations but none have worked. Hoping someone might be able to shed some light.

(I have add the models and url files, as I dont think these are the problem and didnt want to make this post longer than it should be, but feel free to let me know)

Answer 1

Ok, figured it out in the end.

Posting the answer just in case for anyone who needs it.

I needed to repeat or None for request.FILES.

def update_commercial(request, termsandconditions_id):
    commercials = TermsAndConditions.objects.get(pk=termsandconditions_id)
    form = TermsAndConditionsForm(request.POST or None, request.FILES or None,instance=commercials )
    if form.is_valid():
        form.save()
        return redirect('list-commercial')
    return render(request, 'main/update_commercial.html',{'form':form,'commercials':commercials})