python.py 文件源码

def handle_fk_field(self, obj, field):
        if self.use_natural_foreign_keys and hasattr(field.rel.to, 'natural_key'):
            related = getattr(obj, field.name)
            if related:
                value = related.natural_key()
            else:
                value = None
        else:
            value = getattr(obj, field.get_attname())
            if not is_protected_type(value):
                value = field.value_to_string(obj)
        self._current[field.name] = value