Django - formset with crispy forms - missing management form data - django

Question

I'm trying to render this form set:
ProductFormSet = modelformset_factory(
model=Product,
fields='__all__',
extra=5,
)
class ProductFormSetHelper(FormHelper):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.form_tag = False
self.layout = Layout(
Row(
'productCategory',
'name',
'measurement_unit',
)
)
self.render_required_fields = True
with this view:
def product_create(request):
helper = ProductFormSetHelper()
context = {
'helper': helper,
'title': 'Nuovi Prodotti',
}
if request.method == 'GET':
formset = ProductFormSet(queryset=Product.objects.none())
context['formset'] = formset
elif request.method == 'POST':
formset = ProductFormSet(request.POST)
context['formset'] = formset
if formset.is_valid():
formset.save()
messages.success(request, 'Prodotti aggiunti correttamente', fail_silently=True)
return HttpResponseRedirect(reverse('warehouse:products_list'))
else:
return render(request, 'warehouse/product_create.html', context)
return render(request, 'warehouse/product_create.html', context)
and this template:
{% extends "masterpage.html" %}
{% load static %}
{% block headTitle %}
<title>Nuovo Prodotto</title>
{% endblock %}
{% block contentHead %}
{% endblock %}
{% block contentBody %}
{% load document_tags %}
{% load custom_tags %}
{% load crispy_forms_tags %}
<FORM method="POST" autocomplete="off">
<div class="alert alert-info">
{{ title }}
</div>
{{ formset.management_form }}
{% crispy formset helper %}
<input type="submit" class="btn btn-primary margin-left" value="SALVA">
</FORM>
{% endblock %}
Problem is that when I submit the form I get the: ValidationError: management form data are missing! First of all, using crispy forms the management data should be included, second even if I explicitly call with the tag, I still get the ValidationError.
in Every forum I searched online, everyone was missing the management form tag, so I have no clue on what could be wrong....
Any idea?
thank you very much
C

Answer 1

in your Post method you didnt include the "queryset"
formset = ProductFormSet(queryset=Product.objects.WHATEVER_YOU_CHOOSE, request.POST)
and for crispy forms
{% load crispy_forms_tags %}
<form method="post">
{% csrf_token %}
{{ formset|crispy }}
{{ formset.management_form }}
<input type="submit" class="btn btn-primary margin-left" value="SALVA">
</form>
and because you are not working in get_context_data fucntion, just keep it simple
context = {'formset':formset}
Exemple from the docs
from django.forms import modelformset_factory
from django.shortcuts import render
from myapp.models import Author
def manage_authors(request):
AuthorFormSet = modelformset_factory(Author, fields=('name', 'title'))
if request.method == "POST":
formset = AuthorFormSet(
request.POST, request.FILES,
queryset=Author.objects.filter(name__startswith='O'),
)
if formset.is_valid():
formset.save()
# Do something.
else:
formset = AuthorFormSet(queryset=Author.objects.filter(name__startswith='O'))
return render(request, 'manage_authors.html', {'formset': formset})

Answer 2

Hope it can help others. Since I'm having troubles configuring the thousand separator, I tried to change the input.html widget in /templates/django/forms/widgets by adding the |intcomma filter.
This altered the management form data ( one field is set to 1000 by default ), thus corrupting the whole form.