> def clean_username(self):
> data = self.cleaned_data['username']
> try:
> User.objects.get(username=data)
> except User.DoesNotExist:
> return
> raise forms.ValidationError('The username "%s" is already
> taken.' %
> data)
The django docs [1] say that for the clean_<fieldname> method, "Just
like the general field clean() method, above, this method should
return the cleaned data, regardless of whether it changed anything or
not."
Since you're returning nothing, self.cleaned_data['username'] will be
None when saving your user hence the "auth_user.username may not be
NULL" exception.
[1] http://docs.djangoproject.com/en/dev/ref/forms/validation/
hth,
Nuno
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