Formset object has no attribute 'absolute_max' - django

Question

I want to create bills in my app. I have one extra_bill_form and multible item_forms.
view:
def ExtraBillView(request):
item_form_set = formset_factory(ItemForm, formset=BaseItemFormSet, can_delete=True)
extra_bill_form = ExtraBillForm()
if request.method == 'POST':
item_form_set = BaseItemFormSet(request.POST)
extra_bill_form = ExtraBillForm(request.POST)
if extra_bill_form.is_valid() and item_form_set.is_valid():
al1 = extra_bill_form.cleaned_data.get('adress_line1')
al2 = extra_bill_form.cleaned_data.get('adress_line2')
al3 = extra_bill_form.cleaned_data.get('adress_line3')
al4 = extra_bill_form.cleaned_data.get('adress_line4')
for form in item_form_set:
pass
pdb.set_trace()
else:
extra_bill_form = ExtraBillForm()
item_form_set = formset_factory(ItemForm, formset=BaseItemFormSet, extra=0, max_num=5, min_num=1)
context = {
'extra_bill_form': extra_bill_form,
'item_form_set': item_form_set,
}
return render(request, 'extra_bill.html', context)
form:
class ExtraBillForm(forms.Form):
adress_line1 = forms.CharField(label='Adresszeile 1:', required=True)
adress_line2 = forms.CharField(label='Adresszeile 2:', required=False)
adress_line3 = forms.CharField(label='Adresszeile 3:', required=False)
adress_line4 = forms.CharField(label='Adresszeile 4:', required=False)
class ItemForm(forms.Form):
name = forms.CharField(label='Artikelname:')
ust = forms.IntegerField(label='UST:', initial=20)
price_nto = forms.IntegerField(label='Preis netto:', required=False)
price_brt = forms.IntegerField(label='Preis brutto:', required=False)
class BaseItemFormSet(BaseFormSet):
def clean(self):
if self.price_nto is None:
if self.price_brt is None:
return
if any(self.errors):
return
If I submitt my forms, I get an error:
'BaseItemFormSet' object has no attribute 'absolute_max'
how to solve this problem?
Environment:
Request Method: POST
Request URL: http://127.0.0.1:8000/calculator/extrabill/
Django Version: 1.9.4
Python Version: 3.5.1
Installed Applications:
['django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'django_ajax',
'django_bootstrap_dynamic_formsets',
'Bank',
'bootstrap3',
'Building',
'Calculator',
'CounterChange',
'Customer',
'Credit',
'Hackgut',
'Heatingplant',
'Index',
'jquery',
'jquery_ui',
'Measurement',
'Price',
'Rate']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
'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']
Traceback:
File "/usr/lib/python3.5/site-packages/django/core/handlers/base.py" in get_response
149. response = self.process_exception_by_middleware(e, request)
File "/usr/lib/python3.5/site-packages/django/core/handlers/base.py" in get_response
147. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/klaus/PycharmProjects/waerme/Calculator/views.py" in ExtraBillView
94. if extra_bill_form.is_valid() and item_form_set.is_valid():
File "/usr/lib/python3.5/site-packages/django/forms/formsets.py" in is_valid
316. self.errors
File "/usr/lib/python3.5/site-packages/django/forms/formsets.py" in errors
290. self.full_clean()
File "/usr/lib/python3.5/site-packages/django/forms/formsets.py" in full_clean
337. for i in range(0, self.total_form_count()):
File "/usr/lib/python3.5/site-packages/django/forms/formsets.py" in total_form_count
116. return min(self.management_form.cleaned_data[TOTAL_FORM_COUNT], self.absolute_max)
Exception Type: AttributeError at /calculator/extrabill/
Exception Value: 'BaseItemFormSet' object has no attribute 'absolute_max'

Answer 1

The formset factory creates the formset class. You should only call formset_factory once. You can do this outside of the view.
ItemFormSet = formset_factory(ItemForm, formset=BaseItemFormSet, extra=0, max_num=5, min_num=1)
Then, in your view, instantiate the ItemFormSet that was created by formset_factory. You shouldn't instantiate BaseItemFormSet.
if request.method == 'POST':
item_form_set = ItemFormSet(request.POST)
...
else:
item_form_set = ItemFormSet() # blank formset for GET request
context = {
'extra_bill_form': extra_bill_form,
'item_form_set': item_form_set,
}
return render(request, 'extra_bill.html', context)