PostgreSQL-在关联政策中检测到无限递归

Question

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

我的目标是让用户查看和处理，只有员工的那些行的值department_id相同的用户。

一定有这样的东西：

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)
    )
)

但是由于来自Employee的子查询，它提高了infinite recursion detected in policy for relation employee的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，我不知道它有多不错，但是它对我有用。 我在创建视图中找到了解决方案，该视图的current_user部门所在的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)
    );

Answer 2

唉rexter不允许创建角色.. http://rextester.com/QDYC6798

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));
insert into department default values;
insert into department default values;
insert into employee (department_id ) select 1;
insert into employee (department_id ) select 2;
insert into account (login,employee_id) select 'justuser',1;
insert into account (login,employee_id) select 'operator',2;
create role justuser;
create role operator;
set role justuser;
select * from employee;

无法复制。 这不是答案-只是格式化的脚本。 解决后我会抹掉