Typeorm / Postgres：对于 SELECT DISTINCT，ORDER BY 表达式必须出现在选择列表中

Question

我有以下实体：User和Role。 我想通过分页和过滤器选择用户及其角色。

错误信息：

for SELECT DISTINCT, ORDER BY expressions must appear in the select list

@ObjectType()
@Entity()
export class User {
  *******

  @ManyToMany(() => Role, (role) => role.id, {
    nullable: true,
    cascade: true,
  })
  @JoinTable()
  roles: Role[];

  @CreateDateColumn()
  createdAt: Date;

  @UpdateDateColumn()
  updatedAt: Date;
}

@ObjectType()
@Entity()
export class Role {
  @Field((type) => Int)
  @PrimaryGeneratedColumn()
  id: number;

  @Column()
  title: UserRoles;

  @Column()
  description: string;

  @CreateDateColumn()
  createdAt: Date;

  @UpdateDateColumn()
  updatedAt: Date;
}

主要查询逻辑：

******
    const [results, total] = **await queryBuilder
      .orderBy(`"user_${sortField}"`, sortOrder)
      .take(limit)
      .skip((page - 1) * limit)
      .leftJoinAndSelect('user.roles', 'role')
      .getManyAndCount();**

    return {
      results,
      total,
    };

它会导致错误，因为在生成的 SQL 行中 SELECT DISTINCT “distinctAlias”。“user_id”作为“ids_user_id”不包含我订购的字段user_updatedAt。

注意，.take(limit)方法添加了上述行生成的SQL，我找不到编辑所选字段的方法。

生成的SQL：

SELECT DISTINCT
   \"distinctAlias\".\"user_id\" as \"ids_user_id\" 
FROM
   (
      SELECT
         \"user\".\"id\" AS \"user_id\",
         \"user\".\"firstName\" AS \"user_firstName\",
         \"user\".\"lastName\" AS \"user_lastName\",
         \"user\".\"email\" AS \"user_email\",
         \"user\".\"phone\" AS \"user_phone\",
         \"user\".\"isActivated\" AS \"user_isActivated\",
         \"user\".\"refreshToken\" AS \"user_refreshToken\",
         \"user\".\"createdAt\" AS \"user_createdAt\",
         \"user\".\"updatedAt\" AS \"user_updatedAt\",
         \"role\".\"id\" AS \"role_id\",
         \"role\".\"title\" AS \"role_title\",
         \"role\".\"description\" AS \"role_description\",
         \"role\".\"createdAt\" AS \"role_createdAt\",
         \"role\".\"updatedAt\" AS \"role_updatedAt\" 
      FROM
         \"user\" \"user\" 
         LEFT JOIN
            \"user_roles_role\" \"user_role\" 
            ON \"user_role\".\"userId\" = \"user\".\"id\" 
         LEFT JOIN
            \"role\" \"role\" 
            ON \"role\".\"id\" = \"user_role\".\"roleId\"
   )
   \"distinctAlias\" 
ORDER BY
   \"user_updatedAt\" DESC,
   \"user_id\" ASC LIMIT 10"

我做错了什么？ 感谢您的宝贵时间。

Answer 1

这个建议有助于解决问题： https://github.com/typeorm/typeorm/issues/4742#issuecomment-783857414

Answer 2

尝试使用

.offset()

和

.limit()

代替

.skip()

和

.take()

它对我有用。

检查this答案以获取解释。