Rewrite the error dictionary, so that its keys correspond to the model fields.

def _post_clean(self):
        """
        Rewrite the error dictionary, so that its keys correspond to the model fields.
        """
        super(NgModelFormMixin, self)._post_clean()
        if self._errors and self.prefix:
            self._errors = ErrorDict((self.add_prefix(name), value) for name, value in self._errors.items())