

def clean(self):
    data = super(BaseCheckoutForm, self).clean()
    if data.get('email'):
        users = list(User.objects.filter(email=data.get('email')))
        if users:
            if (self.request.user not in users):
                if self.request.user.is_authenticated():
                    self._errors['email'] = self.error_class([_('This e-mail address belongs to a different account.')])
                else:
                    self._errors['email'] = self.error_class([_('This e-mail address might belong to you, but we cannot know for sure because you are not authenticated yet.')])
    return data

dataset/ETHPy150Open matthiask/plata/plata/shop/forms.py BaseCheckoutForm.clean/original