key error when using modelformsets inside a wizardform

[Alfredo Becerra]

hello everybody!

i'm running in this error while using modelformsets inside a wizardform.

Environment:


Request Method: GET
Request URL: http://localhost:8000/alta_socies/proces_alta_projecte_autoocupat/adreces/

Django Version: 1.7.7
Python Version: 2.7.9
Installed Applications:
('django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'django.contrib.formtools',
 'inici',
 'alta_socies',
 'empreses',
 'socies')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware')


Template error:
In template /home/usergci/gestioci/alta_socies/templates/alta_socies/proces_alta_autoocupat.html, error at line 59
   0
   49 :     <div class="row">


   50 :         <div class="medium-12 columns content">


   51 :             <div class="row">


   52 :                 <div class="medium-12 columns">


   53 :                     <div class="group">


   54 :                         <h2>{{ projecte.pas }}</h2>


   55 :                         {% block explicacio_pas %}{% endblock %}


   56 :                     </div>


   57 :                     <form method="post" action="">{% csrf_token %}


   58 :                     {{ wizard.management_form }}


   59 :                      {% if wizard.form.forms %}


   60 :                             {{ wizard.form.management_form }}


   61 :                         {% for form in wizard.form.forms %}


   62 :                             {% block step_factory_form %}


   63 :                             {% endblock %}


   64 :                         {% endfor %}


   65 :                     {% else %}


   66 :                         {% block step_single_form %}


   67 :                         {% endblock %}


   68 :                     {% endif %}


   69 :                     <input class="small radius button" type="submit" name="save_only" value="Guardar y salir"/>

Traceback:
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  137.                 response = response.render()
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/response.py" in render
  103.             self.content = self.rendered_content
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/response.py" in rendered_content
  80.         content = template.render(context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/base.py" in render
  148.             return self._render(context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/base.py" in _render
  142.         return self.nodelist.render(context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/base.py" in render
  844.                 bit = self.render_node(node, context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
  80.             return node.render(context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render
  126.         return compiled_parent._render(context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/base.py" in _render
  142.         return self.nodelist.render(context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/base.py" in render
  844.                 bit = self.render_node(node, context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
  80.             return node.render(context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render
  126.         return compiled_parent._render(context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/base.py" in _render
  142.         return self.nodelist.render(context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/base.py" in render
  844.                 bit = self.render_node(node, context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
  80.             return node.render(context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render
  126.         return compiled_parent._render(context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/base.py" in _render
  142.         return self.nodelist.render(context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/base.py" in render
  844.                 bit = self.render_node(node, context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
  80.             return node.render(context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/defaulttags.py" in render
  402.         return strip_spaces_between_tags(self.nodelist.render(context).strip())
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/base.py" in render
  844.                 bit = self.render_node(node, context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
  80.             return node.render(context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render
  65.                 result = block.nodelist.render(context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/base.py" in render
  844.                 bit = self.render_node(node, context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
  80.             return node.render(context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render
  65.                 result = block.nodelist.render(context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/base.py" in render
  844.                 bit = self.render_node(node, context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
  80.             return node.render(context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/defaulttags.py" in render
  305.                     match = condition.eval(context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/defaulttags.py" in eval
  898.         return self.value.resolve(context, ignore_failures=True)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/base.py" in resolve
  596.                 obj = self.var.resolve(context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/base.py" in resolve
  734.             value = self._resolve_lookup(context)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/template/base.py" in _resolve_lookup
  770.                         current = getattr(current, bit)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/utils/functional.py" in __get__
  55.         res = instance.__dict__[self.func.__name__] = self.func(instance)
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/forms/formsets.py" in forms
  141.         forms = [self._construct_form(i) for i in xrange(self.total_form_count())]
File "/home/usergci/.virtualenvs/heteroceras/local/lib/python2.7/site-packages/django/forms/models.py" in _construct_form
  591.                 kwargs['initial'] = self.initial_extra[i - self.initial_form_count()]

Exception Type: KeyError at /alta_socies/proces_alta_projecte_autoocupat/adreces/
Exception Value: 0

the conflictive code as far as i debugged is:

AdrecesFormSet = modelformset_factory(AdrecaProjecteAutoocupat,
                                      form=FormulariAdrecaProjecteAutoocupat,
                                      can_delete=True)

if i setup "extra=0", it doesn't complain anymore but it doesn't show any form.
my intention is to create different AdrecaProjecteAutoocupat instances via this model formset.
but it seems that if there is no instances on the queryset it raise a key error when asking for extra forms.


every kind of help would be really appreciated.

thx.