Django FormWizard dynamic forms - django

Question

I am trying to create a FormWizard to add multiple instances of a model at once. The second page is dynamic, based on the number to be added, and creates a single "serial number" field - the differentiating factor between all the instances.
I'm getting the first page of the wizard fine, but the second page - the dynamic one - is giving me this Validation Error:
[u'ManagementForm data is missing or has been tampered.']
All the searching I've done points to a formset issue, which I'm not using. What have I done wrong?
forms.py
class CarrierWizardForm1(forms.Form):
part_numbers = forms.ModelChoiceField(queryset=PartNumber.objects.all())
expiry_date = forms.DateField()
qty_at_new = forms.IntegerField()
unit_cost = forms.DecimalField(max_digits=10, min_value=0, decimal_places=3)
cost_currency = forms.ChoiceField(choices=CURRENCY_CHOICES)
class CarrierWizardForm2(forms.Form):
def __init__(self, *args, **kwargs):
qty = kwargs.pop('qty')
super(CarrierWizardForm2,self).__init__(*args,**kwargs)
for i in qty:
self.fields['serial_%s' % i] = forms.CharField(max_length=45)
The defs in CarrierWizardForm2 is a fairly common idiom that is noted all over the web as a solution to this problem, including by Jacobian Nor is their anything crazy in urls
urls.py
carrier_wizard_forms = [CarrierWizardForm1, CarrierWizardForm2]
...
url(r'^carrier/add/$', views.CarrierCreateWizard.as_view(carrier_wizard_forms)),
My views are relatively complex, but nothing outrageous. Note there are some fields that aren't in the forms - they are filled with context data (user, creation date, etc)
views.py
TEMPLATES = {"0": "inventory/carrier_wizard_form1.html",
"1": "inventory/carrier_wizard_form2.html"}
class CarrierCreateWizard(SessionWizardView):
def get_template_names(self):
return [TEMPLATES[self.steps.current]]
''' Get the qty from form 1 to indicate how many fields
form2 needs for serial numbers
'''
def get_form_initial(self, step):
current_step = self.storage.current_step
if current_step == 'step1':
prev_data = self.storage.get_step_data('step0')
return self.initial_dict.get(step, {'qty': qty})
return self.initial_dict.get(step, {})
def done(self, form_list, **kwargs):
details = form_list[0]
list_of_serial_nos = form_list[1]
for serial_name, serial in list_of_serial_nos.cleaned_data.items():
carrier = Carrier()
carrier.part_numbers = details.cleaned_data['part_numbers']
carrier.creation_date = datetime.datetime.today()
carrier.expiry_date = details.cleaned_data['expiry_date']
carrier.qty_at_new = 1
carrier.qty_current = 1
carrier.serial = serial
carrier.unit_cost = details.cleaned_data['unit_cost']
carrier.cost_currency = details.cleaned_data['cost_currency']
carrier.user = self.request.user
carrier.save()
My second template is bland, although you can see three unsuccessful attempts to rectify this issue.
inventory/carrier_wizard_form2.html
{% extends "base.html" %}
{% block content %}
<p>Step {{ wizard.steps.step1 }} of {{ wizard.steps.count }}</p>
<form action="" method="post">{% csrf_token %}
{# Attempt 3 #}
{{ formset }}
{# Attempt 2 {{ form.management_form }}
{% for f in form %}
{{ f.as_p }}
{% endfor %}
#}
{# Attempt 1 {{ form }} #}
<input type=submit>
</form>
{% endblock %}
EDIT
*As requested, both of my templates*
inventory/carrier_wizard_form1.html
{% extends "base.html" %}
{% block content %}
<p>Step {{ wizard.steps.step1 }} of {{ wizard.steps.count }}</p>
<form action="" method="post">{% csrf_token %}
{{ wizard.form.as_p }}
<input type=submit>
</form>
{% endblock %}
templates/inventory/carrier_wizard_form2.html
{% extends "base.html" %}
{% block content %}
<p>Step {{ wizard.steps.step1 }} of {{ wizard.steps.count }}</p>
<form action="" method="post">{% csrf_token %}
<table>
{{ wizard.form }}
{#
{{ wizard.management_form }}
{% if wizard.form.forms %}..
{{ wizard.form.management_form }}
{% for form in wizard.form.forms %}
{{ form }}
{% endfor %}
{% else %}
{{ wizard.form }}.
{% endif %} #}
</table>
<input type=submit>
</form>
{% endblock %}

Answer 1

Your template is not correct, use {{ wizard.management_form }} to add wizard management related stuff and use {{ wizard.form }} for forms.
From the reference doc the template is like:
{% extends "base.html" %}
{% block content %}
<p>Step {{ wizard.steps.step1 }} of {{ wizard.steps.count }}</p>
<form action="" method="post">{% csrf_token %}
{{ wizard.management_form }} {#add wizard management data #}
{% if wizard.form.forms %} {# if form is formset #}
{{ wizard.form.management_form }} {#formset's management data #}
{% for form in wizard.form.forms %}
{{ form }}
{% endfor %}
{% else %}
{{ wizard.form }} {#for normal form #}
{% endif %}
</table>
{% if wizard.steps.prev %}
<button name="wizard_goto_step" type="submit" value="{{ wizard.steps.first }}">{% trans "first step" %}</button>
<button name="wizard_goto_step" type="submit" value="{{ wizard.steps.prev }}">{% trans "prev step" %}</button>
{% endif %}
<input type="submit" value="{% trans "submit" %}"/>
</form>