PostgreSQL - 在关系策略中检测到无限递归

Question

数据库中有 3 个表 - 部门、员工、帐户。一个部门有很多员工。Employee 包含列department_id bigintAccount 表包含 columns login varchar，employee_id bigint用于将 Postgres 用户（角色）绑定到 Employee 中的行。

我的目标是让用户仅查看和使用 Employee 的值与department_id用户相同的那些行。

一定有类似的东西：

CREATE POLICY locale_policy ON employee
TO justuser, operator
USING (department_id =
    (SELECT department_id FROM employee WHERE id =
        (SELECT employee_id FROM account WHERE login = CURRENT_USER)
    )
)

但由于 Employee 的子查询，它正在提高infinite recursion detected in policy for relation employee。

编辑：关系定义为：

create table department(
    id serial primary key);
create table employee(
    id serial primary key,
    department_id int8 not null references department(id));
create table account(
    id serial primary key,
    login varchar(100) not null unique,
    employee_id int8 not null unique references employee(id));

Answer 1

好吧，我不知道它有多好，但它对我有用。我找到了一个解决方案，创建一个视图，其中 current_user 的部门 id ，然后检查它是否匹配：

CREATE VIEW curr_department AS
    (SELECT department_id as id FROM employee WHERE id =
        (SELECT employee_id FROM account WHERE login = current_user)
    );

CREATE POLICY locale_policy ON employee
    TO justuser, operator
    USING (department_id =
        (SELECT id FROM curr_department)
    );