求助 nestjs many-to-many 查询失败 - V2EX
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xiaoming1992
V2EX    Javascript

求助 nestjs many-to-many 查询失败

  •  
  •   xiaoming1992 2021-11-27 03:45:38 +08:00 1608 次点击
    这是一个创建于 1488 天前的主题,其中的信息可能已经有所发展或是发生改变。

    我有两个 Entity:

    @Entity() export class UserEntity { @Column({ unique: true, nullable: false }) id: string @ManyToMany(() => RoleEntity, (r) => r.users, { cascade: true, }) @JoinTable() roles?: RoleEntity[] } @Entity() export class RoleEntity { @Column({ unique: true, nullable: false }) name: string @ManyToMany(() => UserEntity, (u) => u.roles) users?: UserEntity[] } 

    我想构造一个查询:

    api.user.search({ roles: [ 'admin', 'vip', ], }) 

    通过传递 RoleEntity.name 数组, 能查询到所有拥有这些 role 的 user, 只要 search.roles 和 user.roles 存在交集就能查询出来

    也就是说, 王小明的 roles 是 ['loser', 'vip'], 而我查询 ['admin', 'vip'], 那么, 王小明也应该被查询出来, 因为他是 vip

    但是我的方法报错 Cannot query across many-to-many for property roles, 我的方法是:

    userRepo.findAndCount({ where: { roles: { name: Raw((alias) => `${alias} @> ARRAY[:...roles]`, { roles: ['admin', 'vip'] }), } } }) 

    网上只有关于 roles 是数组时的查询, 但是我的 roles 是 Entity 数组, 是 many-to-many, 我只是个菜鸟前端, 实在搞不来了, 大佬们救救孩子吧

    xiaoming1992
        1
    xiaoming1992  
    OP
       2021-11-27 20:07:32 +08:00
    做到了

    userRepo.createQueryBuilder('user')
    .leftJoin('user.roles', 'role')
    .andWhere('role.name IN (:...roles)', { roles })
    .getMany()
        2
    xiaoming1992  
    OP
       2021-11-27 20:11:42 +08:00
    @xiaoming1992 擦,并不是。。。
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