This has served me well of the last couple of years of using Django:
from django import forms class _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_data class BaseModelForm(_BaseForm, forms.ModelForm): pass class 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)
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()