A Django base class for all your Forms

from django import formsclass _BaseForm(object):    def clean(self):        cleaned_data = super(_BaseForm, self).clean()        for field in cleaned_data:            if isinstance(cleaned_data[field], basestring):                cleaned_data[field] = (                    cleaned_data[field].replace('\r\n', '\n')                    .replace(u'\u2018', "'").replace(u'\u2019', "'").strip())        return cleaned_dataclass BaseModelForm(_BaseForm, forms.ModelForm):    passclass BaseForm(_BaseForm, forms.Form):    pass

So instead of doing…

class SigupForm(forms.Form):    name = forms.CharField(max_length=100)    nick_name = forms.CharField(max_length=100, required=False)

…you do:

class SigupForm(BaseForm):    name = forms.CharField(max_length=100)    nick_name = forms.CharField(max_length=100, required=False)

What it does is that it makes sure that any form field that takes a string strips all preceeding and trailing whitespace. It also replaces the strange “curved” apostrophe ticks that Microsoft Windows sometimes uses.

Yes, this might all seem trivial and I’m sure there’s something as good or better out there but isn’t it a nice thing to never have to worry about doing things like this again:

class SignupForm(forms.Form):    ...    def clean_name(self):        return self.cleaned_data['name'].strip()#...or...form = SignupForm(request.POST)if form.is_valid():    name = form.cleaned_data['name'].strip()

UPDATE

This breaks some fields, like DateField.

>>> class F(BaseForm):...     start_date = forms.DateField()...     def clean_start_date(self):...         return self.cleaned_data['start_date']...>>> f=F({'start_date': '2013-01-01'})>>> f.is_valid()True>>> f.cleaned_data['start_date']datetime.datetime(2013, 1, 1, 0, 0)

As you can see, it cleans up '2013-01-01' into datetime.datetime(2013, 1, 1, 0, 0) when it should become datetime.date(2013, 1, 1).

Not sure why yet.

原文地址：A Django base class for all your Forms, 感谢原作者分享。 发光并非太阳的专利，你也可以发光