我已經編寫了一個應用程序,使用表單收集信息,然後通過電子郵件發送。這些表單中的很多都有一個用於將文件附加到電子郵件的文件。我想驗證兩件事情,即文件的大小(以確保電子郵件已被我們的郵件服務器接受。我還想檢查文件擴展名,以阻止附加不適合我們用戶使用的文件類型。)擴展表單域以添加新的驗證
(這是蟒蛇類,我想擴展)
class FileField(Field):
widget = FileInput
default_error_messages = {
'invalid': _(u"No file was submitted. Check the encoding type on the form."),
'missing': _(u"No file was submitted."),
'empty': _(u"The submitted file is empty."),
'max_length': _(u'Ensure this filename has at most %(max)d characters (it has %(length)d).'),
}
def __init__(self, *args, **kwargs):
self.max_length = kwargs.pop('max_length', None)
super(FileField, self).__init__(*args, **kwargs)
def clean(self, data, initial=None):
super(FileField, self).clean(initial or data)
if not self.required and data in EMPTY_VALUES:
return None
elif not data and initial:
return initial
# UploadedFile objects should have name and size attributes.
try:
file_name = data.name
file_size = data.size
except AttributeError:
raise ValidationError(self.error_messages['invalid'])
if self.max_length is not None and len(file_name) > self.max_length:
error_values = {'max': self.max_length, 'length': len(file_name)}
raise ValidationError(self.error_messages['max_length'] % error_values)
if not file_name:
raise ValidationError(self.error_messages['invalid'])
if not file_size:
raise ValidationError(self.error_messages['empty'])
return data
我結束了以下你的方法。謝謝你的幫助! – duallain 2010-04-29 15:43:14