Question

我试图覆盖要检查的表单的clean()方法，IBAN属性是否唯一。每个user都可以拥有IBAN。出于某种原因，django说形式没有属性IBAN，这是不正确的。正如您所看到的，它是表单的第一个属性。

你知道什么问题吗？

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：

环境：

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

由于您是validating the value of a single field iban，最好定义一个clean_iban方法而不是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

clean方法适用于validating fields that depend on each other。如果您覆盖clean，则无法假设某个值位于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

在您调用super(TranslatorRegistrationForm, self).clean()后，您应该能够访问cleaned_data['IBAN']中的IBAN字段的值。属性self.IBAN是字段定义，而不是字段的值。

例外价值：＆＃39;表格＆＃39;对象没有属性＆＃39;属性＆＃39;

2 个答案: