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PODjango FormWizard dynamic forms
 

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  1. PODjango FormWizard dynamic forms
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    <p>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. </p> <p>I'm getting the first page of the wizard fine, but the second page - the dynamic one - is giving me this Validation Error: </p> <blockquote> <p>[u'ManagementForm data is missing or has been tampered.']</p> </blockquote> <p>All the searching I've done points to a formset issue, which I'm not using. What have I done wrong?</p> <p><strong>forms.py</strong></p> <pre><code>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) </code></pre> <p>The defs in CarrierWizardForm2 is a fairly common idiom that is noted all over the web as a solution to this problem, including by <a href="http://jacobian.org/writing/dynamic-form-generation/" rel="nofollow">Jacobian</a> Nor is their anything crazy in urls</p> <p><strong>urls.py</strong> </p> <pre><code>carrier_wizard_forms = [CarrierWizardForm1, CarrierWizardForm2] ... url(r'^carrier/add/$', views.CarrierCreateWizard.as_view(carrier_wizard_forms)), </code></pre> <p>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)</p> <p><strong>views.py</strong> </p> <pre><code>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() </code></pre> <p>My second template is bland, although you can see three unsuccessful attempts to rectify this issue.</p> <p><strong>inventory/carrier_wizard_form2.html</strong></p> <pre><code>{% extends "base.html" %} {% block content %} &lt;p&gt;Step {{ wizard.steps.step1 }} of {{ wizard.steps.count }}&lt;/p&gt; &lt;form action="" method="post"&gt;{% csrf_token %} {# Attempt 3 #} {{ formset }} {# Attempt 2 {{ form.management_form }} {% for f in form %} {{ f.as_p }} {% endfor %} #} {# Attempt 1 {{ form }} #} &lt;input type=submit&gt; &lt;/form&gt; {% endblock %} </code></pre> <p><strong>EDIT</strong> *<em>As requested, both of my templates</em>*</p> <p>inventory/carrier_wizard_form1.html</p> <pre><code>{% extends "base.html" %} {% block content %} &lt;p&gt;Step {{ wizard.steps.step1 }} of {{ wizard.steps.count }}&lt;/p&gt; &lt;form action="" method="post"&gt;{% csrf_token %} {{ wizard.form.as_p }} &lt;input type=submit&gt; &lt;/form&gt; {% endblock %} </code></pre> <p>templates/inventory/carrier_wizard_form2.html</p> <pre><code>{% extends "base.html" %} {% block content %} &lt;p&gt;Step {{ wizard.steps.step1 }} of {{ wizard.steps.count }}&lt;/p&gt; &lt;form action="" method="post"&gt;{% csrf_token %} &lt;table&gt; {{ 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 %} #} &lt;/table&gt; &lt;input type=submit&gt; &lt;/form&gt; {% endblock %} </code></pre>
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