I have a form that contains a parent object in the header and then lists the children as a formset in the same HTML <form>. I can create new "families" of parent objects and children just fine, but I can't edit them. I've tracked the error down to the line where the view is trying to instantiate the FormSet object for the children from the POST arguments. Python is complaining about an IndexError (see traceback below).
I've found that I can modify parents just fine when there are zero children, but as soon as there are child objects, everything falls apart when the model formset is being instantiated. Has anyone seen this before? Many thanks for any help, Andy ================================= Environment: Request Method: POST Request URL: http://127.0.0.1:8000/mixture/13/edit/ Django Version: 1.2.1 Python Version: 2.6.1 Installed Applications: ['django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.sites', 'django.contrib.messages', 'django.contrib.admin', 'django.contrib.admindocs', 'form_utils', 'sgm.general', 'sgm.mixture', 'sgm.msds', 'sgm.account', 'sgm.errors'] Installed Middleware: ('django.middleware.common.CommonMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.middleware.csrf.CsrfViewMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.messages.middleware.MessageMiddleware', 'debug_toolbar.middleware.DebugToolbarMiddleware') Traceback: File "/Library/Python/2.6/site-packages/django/core/handlers/base.py" in get_response 100. response = callback(request, *callback_args, **callback_kwargs) File "/Library/Python/2.6/site-packages/django/contrib/auth/decorators.py" in _wrapped_view 25. return view_func(request, *args, **kwargs) File "/Users/abadstubner/Documents/Projects/specialty_gas_manager/../specialty_gas_manager/mixture/views.py" in edit_mixture 78. comp_formset = forms.CustomerMixtureComponentFormset( request.POST, prefix='comps' ) File "/Library/Python/2.6/site-packages/django/forms/models.py" in __init__ 698. queryset=qs) File "/Library/Python/2.6/site-packages/django/forms/models.py" in __init__ 423. super(BaseModelFormSet, self).__init__(**defaults) File "/Library/Python/2.6/site-packages/django/forms/formsets.py" in __init__ 47. self._construct_forms() File "/Library/Python/2.6/site-packages/django/forms/formsets.py" in _construct_forms 97. self.forms.append(self._construct_form(i)) File "/Library/Python/2.6/site-packages/django/forms/models.py" in _construct_form 711. form = super(BaseInlineFormSet, self)._construct_form(i, **kwargs) File "/Library/Python/2.6/site-packages/django/forms/models.py" in _construct_form 447. kwargs['instance'] = self.get_queryset()[i] File "/Library/Python/2.6/site-packages/django/db/models/query.py" in __getitem__ 172. return self._result_cache[k] Exception Type: IndexError at /mixture/13/edit/ Exception Value: list index out of range Here's the POST data, in case anyone can see anything obvious there: account u'1' comments u'' comps-0-concentration u'20%' comps-0-customermixture u'13' comps-0-gas u'Benzene' comps-0-id u'16' comps-0-solubility u'' comps-1-concentration u'20%' comps-1-customermixture u'13' comps-1-gas u'Acetaldehyde' comps-1-id u'17' comps-1-solubility u'' comps-2-concentration u'Balance' comps-2-customermixture u'13' comps-2-gas u'Carbon Dioxide' comps-2-id u'18' comps-2-solubility u'' comps-INITIAL_FORMS u'3' comps-MAX_NUM_FORMS u'' comps-TOTAL_FORMS u'3' csrfmiddlewaretoken u'3...a' #redacted engineering_controls u'1' hazard_warning u'2' name u'Sample Mixture3' -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-us...@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
