elements.py 文件源码

def _corresponding_column_or_error(fromclause, column,
                                   require_embedded=False):
    c = fromclause.corresponding_column(column,
                                        require_embedded=require_embedded)
    if c is None:
        raise exc.InvalidRequestError(
            "Given column '%s', attached to table '%s', "
            "failed to locate a corresponding column from table '%s'"
            %
            (column,
             getattr(column, 'table', None),
             fromclause.description)
        )
    return c