GraphQL：添加计算字段时出错

Question

我正在尝试使用 hasura API 向模式“abc”中的 graphql table“用户”添加一个计算字段 API 但收到以下错误：

Saving computed field failed
in table "abc.user": in computed field "full_name": the computed field "full_name" 
cannot be added to table "abc.user" because the function "abc.fullname" is 
of type VOLATILE; cannot be added as a computed field

函数添加正确:

    CREATE OR REPLACE FUNCTION abc.fullname(userrow abc.user)
    RETURNS TEXT AS $$
BEGIN
    SELECT userrow.first_name || ' ' || userrow.last_name;
END;
$$ LANGUAGE plpgsql;

我可以 select 从下拉列表中使用函数“全名”，但在添加计算字段时出错。任何指导表示赞赏。谢谢。

Answer 1

错误消息试图告诉您。您需要将该函数显式声明为 immutable，以便它可以在计算列的定义中使用：

create or replace function abc.fullname(userrow abc.user)
returns text immutable as $$
begin
    select userrow.first_name || ' ' || userrow.last_name;
end;
$$ language plpgsql;

GraphQL：添加计算字段时出错

GraphQL : Error while adding computed fields

postgresql

computed-field

psql

graphql

hasura