pgcrypto/mixins.py
def pre_save(self, model_instance, add):
        """Save the original_value."""
        if self.original:
            original_value = getattr(model_instance, self.original)
            setattr(model_instance, self.attname, original_value)

        return super(HashMixin, self).pre_save(model_instance, add)
def pre_save(self, model_instance, add):
        """Save the original_value."""
        if self.original:
            original_value = getattr(model_instance, self.original)
            setattr(model_instance, self.attname, original_value)

        return super(HashMixin, self).pre_save(model_instance, add)
Save the original_value.