为什么角色无法删除，因为某些对象依赖于它

Question

数据库“mydb”由角色“mydb_owner”拥有。

用户“currentuser”尝试使用以下命令从此数据库中删除角色“roletodelete”

revoke all on all tables in schema public,firma1 from "roletodelete" cascade;
revoke all on all sequences in schema public,firma1 from "roletodelete" cascade;
revoke all on database mydb from "roletodelete" cascade;
revoke all on all functions in schema public,firma1 from "roletodelete" cascade;
revoke all on schema public,firma1 from "roletodelete" cascade;
revoke mydb_owner from "roletodelete" cascade;
ALTER DEFAULT PRIVILEGES IN SCHEMA public,firma1 revoke all ON TABLES from "roletodelete";
GRANT "roletodelete" TO "currentuser";
reassign owned by "roletodelete" to mydb_owner;
drop owned by "roletodelete";
drop role "roletodelete";

我以超级用户身份运行它并得到

    ERROR: role "roletodelete" cannot be dropped because some objects depend on it
DETAIL:  privileges for default privileges on new relations belonging to role currentuser in schema public
privileges for default privileges on new relations belonging to role currentuser schema firma1

如何创建保证删除角色的脚本？

该脚本已包含：

revoke all on schema public,firma1 from "roletodelete" cascade;

为什么 postgres 抱怨模式 public 的权限依赖于这个角色（如果它们被撤销）？如何解决这个问题？

有很多关于此的问题和答案，例如：

无法删除 PostgreSQL 角色。错误：“无法删除，因为某些对象依赖于它”

PostgreSQL - 如何快速删除具有现有权限的用户

https://dba.stackexchange.com/questions/155332/find-objects-linked-to-a-postgresql-role

我将他们的建议添加到上面的删除脚本中，但问题仍然存在。

Answer 1

遇到了同样的问题，并设法使用以下SQL解决它

这应该在删除用户之前删除所有权限：

REASSIGN OWNED BY <user> TO <other-user>;

ALTER DEFAULT PRIVILEGES IN SCHEMA <schema> REVOKE GRANT OPTION FOR ALL PRIVILEGES ON TABLES FROM <user>;
ALTER DEFAULT PRIVILEGES IN SCHEMA <schema> REVOKE GRANT OPTION FOR ALL PRIVILEGES ON SEQUENCES FROM <user>;
ALTER DEFAULT PRIVILEGES IN SCHEMA <schema> REVOKE GRANT OPTION FOR ALL PRIVILEGES ON FUNCTIONS FROM <user>;
ALTER DEFAULT PRIVILEGES IN SCHEMA <schema> REVOKE GRANT OPTION FOR ALL PRIVILEGES ON ROUTINES FROM <user>;
ALTER DEFAULT PRIVILEGES IN SCHEMA <schema> REVOKE GRANT OPTION FOR ALL PRIVILEGES ON TYPES FROM <user>;

REVOKE GRANT OPTION FOR ALL PRIVILEGES ON SCHEMA <schema> FROM <user>;
REVOKE GRANT OPTION FOR ALL PRIVILEGES ON ALL TABLES IN SCHEMA <schema> FROM <user>;
REVOKE GRANT OPTION FOR ALL PRIVILEGES ON ALL SEQUENCES IN SCHEMA <schema> FROM <user>;
REVOKE GRANT OPTION FOR ALL PRIVILEGES ON ALL FUNCTIONS IN SCHEMA <schema> FROM <user>;
REVOKE GRANT OPTION FOR ALL PRIVILEGES ON ALL PROCEDURES IN SCHEMA <schema> FROM <user>;
REVOKE GRANT OPTION FOR ALL PRIVILEGES ON ALL ROUTINES IN SCHEMA <schema> FROM <user>;

ALTER DEFAULT PRIVILEGES IN SCHEMA <schema> REVOKE ALL PRIVILEGES ON TABLES FROM <user>;
ALTER DEFAULT PRIVILEGES IN SCHEMA <schema> REVOKE ALL PRIVILEGES ON SEQUENCES FROM <user>;
ALTER DEFAULT PRIVILEGES IN SCHEMA <schema> REVOKE ALL PRIVILEGES ON FUNCTIONS FROM <user>;
ALTER DEFAULT PRIVILEGES IN SCHEMA <schema> REVOKE ALL PRIVILEGES ON ROUTINES FROM <user>;
ALTER DEFAULT PRIVILEGES IN SCHEMA <schema> REVOKE ALL PRIVILEGES ON TYPES FROM <user>;

REVOKE ALL PRIVILEGES ON SCHEMA <schema> FROM <user>;
REVOKE ALL PRIVILEGES ON ALL TABLES IN SCHEMA <schema> FROM <user>;
REVOKE ALL PRIVILEGES ON ALL SEQUENCES IN SCHEMA <schema> FROM <user>;
REVOKE ALL PRIVILEGES ON ALL FUNCTIONS IN SCHEMA <schema> FROM <user>;
REVOKE ALL PRIVILEGES ON ALL PROCEDURES IN SCHEMA <schema> FROM <user>;
REVOKE ALL PRIVILEGES ON ALL ROUTINES IN SCHEMA <schema> FROM <user>;

DROP ROLE <user>;

首先将所有数据库对象分配给另一个用户，撤销所有权限，包括默认权限，然后最终删除角色本身。