Exception Value: 'Form' object has no attribute 'attribute' - django

Question

I'm trying to override clean() method of the form to check, whether attribute IBAN is unique or not. Each user can have IBAN. For some reason, django says that form has no attribute IBAN which isn't true. As you can see it's a first attribute of the form.
Do you know what's problem?
class TranslatorRegistrationForm(forms.Form):
IBAN = forms.CharField(max_length=40, required=True)
first_name = forms.CharField(max_length=40, required=True)
last_name = forms.CharField(max_length=40, required=True)
languages = forms.ModelMultipleChoiceField(Language.objects.all(), label='Languages: ',
help_text="You can choose from UNKNOWN levels, to gain level, you will be tested")
def __init__(self,user,*args, **kwargs):
super(TranslatorRegistrationForm, self).__init__(*args, **kwargs)
self.user = user
def clean(self):
cleaned_data = super(TranslatorRegistrationForm, self).clean()
if len(UserProfile.objects.filter(IBAN=self.IBAN).exclude(user=self.user))>0:
raise ValidationError
return cleaned_data
TRACEBACK:
Environment:
Request Method: POST
Request URL: http://127.0.0.1:8000/register-as-translator/
Django Version: 1.8.12
Python Version: 2.7.10
Installed Applications:
('django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'SolutionsForLanguagesApp',
'crispy_forms',
'super_inlines',
'django_tables2',
'language_tests',
'smart_selects',
'django_extensions',
'constance',
'constance.backends.database',
'nested_inline')
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',
'django.middleware.security.SecurityMiddleware',
'django.middleware.locale.LocaleMiddleware')
Traceback:
File "C:\Users\Milano\PycharmProjects\FutileStudio\SolutionsForLanguages_2\venv\lib\site-packages\django\core\handlers\base.py" in get_response
132. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\Milano\PycharmProjects\FutileStudio\SolutionsForLanguages_2\venv\lib\site-packages\django\contrib\auth\decorators.py" in _wrapped_view
22. return view_func(request, *args, **kwargs)
File "C:\Users\Milano\PycharmProjects\FutileStudio\SolutionsForLanguages_2\SolutionsForLanguagesApp\views.py" in register_as_translator
110. if register_as_translator_form.is_valid():
File "C:\Users\Milano\PycharmProjects\FutileStudio\SolutionsForLanguages_2\venv\lib\site-packages\django\forms\forms.py" in is_valid
184. return self.is_bound and not self.errors
File "C:\Users\Milano\PycharmProjects\FutileStudio\SolutionsForLanguages_2\venv\lib\site-packages\django\forms\forms.py" in errors
176. self.full_clean()
File "C:\Users\Milano\PycharmProjects\FutileStudio\SolutionsForLanguages_2\venv\lib\site-packages\django\forms\forms.py" in full_clean
393. self._clean_form()
File "C:\Users\Milano\PycharmProjects\FutileStudio\SolutionsForLanguages_2\venv\lib\site-packages\django\forms\forms.py" in _clean_form
417. cleaned_data = self.clean()
File "C:\Users\Milano\PycharmProjects\FutileStudio\SolutionsForLanguages_2\SolutionsForLanguagesApp\forms.py" in clean
116. if len(UserProfile.objects.filter(IBAN=self.IBAN).exclude(user=self.user))>0:
Exception Type: AttributeError at /register-as-translator/
Exception Value: 'TranslatorRegistrationForm' object has no attribute 'IBAN'

Answer 1

Since you are validating the value of a single field iban, it would be better to define a clean_iban method instead of clean:
def clean_iban(self):
iban = self.cleaned_data['IBAN']
# Note using exists() is more efficient and pythonic than 'len() > 0'
if UserProfile.objects.filter(IBAN=iban).exists():
raise ValidationError('Invalid IBAN')
return iban
The clean method is meant for validating fields that depend on each other. If you override clean, you can't assume that a value will be in cleaned_data.
def clean(self):
cleaned_data = super(TranslatorRegistrationForm, self).clean()
if 'iban' in cleaned_data:
iban = cleaned_data['iban']
if len(UserProfile.objects.filter(IBAN=self.IBAN).exclude(user=self.user))>0:
raise ValidationError('Invalid IBAN')
return cleaned_data

Answer 2

Once you've called super(TranslatorRegistrationForm, self).clean(), you should be able to access the value of the IBAN field in cleaned_data['IBAN']. The attribute self.IBAN is a field definition, rather than the field's value.