Validation error in Model formsets

Using Django
1

I’m creating a view to update information on a user using Model formsets and i get a validation error when i try to add new information. Here is a traceback.

            Traceback (most recent call last):
            File "/home/jojoe/.local/lib/python3.8/site-packages/django/core/handlers/exception.py", line 34, in inner
            response = get_response(request)
            File "/home/jojoe/.local/lib/python3.8/site-packages/django/core/handlers/base.py", line 115, in _get_response
            response = self.process_exception_by_middleware(e, request)
            File "/home/jojoe/.local/lib/python3.8/site-packages/django/core/handlers/base.py", line 113, in _get_response
            response = wrapped_callback(request, *callback_args, **callback_kwargs)
            File "/home/jojoe/porfolio_app/portfolioapp/portfolio/views.py", line 63, in portfolio_update_form
            if skillset.is_valid():
            File "/home/jojoe/.local/lib/python3.8/site-packages/django/forms/formsets.py", line 308, in is_valid
            self.errors
            File "/home/jojoe/.local/lib/python3.8/site-packages/django/forms/formsets.py", line 288, in errors
            self.full_clean()
            File "/home/jojoe/.local/lib/python3.8/site-packages/django/forms/formsets.py", line 329, in full_clean
            for i in range(0, self.total_form_count()):
            File "/home/jojoe/.local/lib/python3.8/site-packages/django/forms/formsets.py", line 112, in total_form_count
            return min(self.management_form.cleaned_data[TOTAL_FORM_COUNT], self.absolute_max)
            File "/home/jojoe/.local/lib/python3.8/site-packages/django/utils/functional.py", line 48, in __get__
            res = instance.__dict__[self.name] = self.func(instance)
            File "/home/jojoe/.local/lib/python3.8/site-packages/django/forms/formsets.py", line 92, in management_form
            raise ValidationError(
            django.core.exceptions.ValidationError: ['ManagementForm data is missing or has been tampered with']

This is the view logic.

            def portfolio_update_form(request):
                SkillsFormSet = modelformset_factory(Skills, form=SkillsForm) 
                if request.method == 'POST':
                    skillset = SkillsFormSet(request.POST, queryset=Skills.objects.filter(occupation_id=request.user.occupation.id))
                    if skillset.is_valid():
                    instances = skillset.save()

                else:
                    skillset = SkillsFormSet()
                    context = {'skillset': skillset}

                return render(request, 'portfolio/portfolio_update.html', context)
2

When you are dynamically adding forms to a formset, you need to make the appropriate modifications to the management form variables. (In particular, see the 2nd paragraph in that section)

3

Yea i have that in my template but the error is the same.

            <form action="{% url 'portfolioform' %}" method="POST" enctype="multipart/form-data" id="form-id" class="container-xl border bg-light text-dark">
                {% csrf_token %}
                <fieldset>
                    <legend class="text-center">Update your porfolio</legend>
                    {{skillset.management_form }}
                    <table>
                        {% for skill in skillset %}

                        {{skill}}

                        {% endfor %}
                    <button class="m-4 floated btn btn-primary" type="submit">Update</button>
                </fieldset>
            </form>
4

Yes, but are you properly updating those variables when you add instances to the form? (That’s something you need to do in your JavaScript code.)