如何使用 @Afterload 保存列，嵌套关系 TypeORM

问题描述

我想在我的用户个人资料实体中输入帖子数量。

• user_profile.entity.ts

@Entity()
@Unique(['username'])
export class UserProfile {
  /** Columns */
  @PrimaryGeneratedColumn('uuid')
  readonly id: string;
 
  @Column('timestamptz')
  @CreateDateColumn()
  readonly created_at: Date;
 
  @Column('timestamptz')
  @UpdateDateColumn()
  readonly updated_at: Date;
 
  @Apiproperty()
  @Column({ length: 255 })
  @Isstring()
  @Length(3,50)
  username: string;
 
  @Column()
  post_count: number;
 
  @ApiProperty({ readOnly: true })
  @Column('uuid')
  @IsUUID('4')
  user_id: string;
 
  @ApiProperty({ readOnly: true })
  @Column({ default: 0,nullable: true })
  @IsOptional()
  exp?: number;
 
  @ApiProperty({ readOnly: true })
  @Column({ default: 1,nullable: true })
  @IsOptional()
  level?: number;
 
  /** Relations */
  @OnetoOne((type) => User,(user) => user.profile,{ onDelete: 'CASCADE' })
  @JoinColumn({ name: 'user_id',referencedColumnName: 'id' })
  user: User;
 
  // ** Hooks
 
  @AfterLoad()
  updatePostCount() {
this.post_count = this.user.posts.length;
  }
}

• user.entity.ts

@Entity()
@Unique(['email'])
@Check(`
  COALESCE((provider = 'local')::integer,0) 
  + 
  COALESCE(LENGTH(social_id::text)::boolean::integer,0)
  = 1
`)
export class User {
  /** Columns */
 
  @Apiproperty()
  @PrimaryGeneratedColumn('uuid')
  readonly id: string;
 
  @Apiproperty()
  @Column('timestamptz')
  @CreateDateColumn()
  readonly created_at: Date;
 
  @Apiproperty()
  @Column('timestamptz')
  @UpdateDateColumn()
  readonly updated_at: Date;
 
  @Apiproperty()
  @Column({ length: 255 })
  @IsEmail()
  email: string;
 
  /** Relations */
 
  @OnetoMany((type) => Post,(post) => post.author)
  posts: Post[];
 
  @Apiproperty()
  @OnetoOne((type) => UserProfile,(userProfile) => userProfile.user,{
    cascade: true,})
  profile: UserProfile;
 
  @AfterLoad()
  asdfasdf() {
    console.log('유저 entity :');
  }
}

• post.entity.ts

@Entity()
export class Post {
  /** Columns */
 
  @PrimaryGeneratedColumn('uuid')
  readonly id: string;
 
  @Column('timestamptz')
  @CreateDateColumn()
  readonly created_at: Date;
 
  @Column('timestamptz')
  @UpdateDateColumn()
  readonly updated_at: Date;
 
  @Apiproperty()
  @Column({ length: 255 })
  @Isstring()
  title: string;
 
  @Apiproperty()
  @Column('text')
  @Isstring()
  contents: string;
 
  @ApiProperty({ readOnly: true })
  @Column('uuid')
  @IsUUID('4')
  user_id: string;
 
  /** Relations */
  @ManyToOne((type) => User,(user) => user.posts,// eager: true,onDelete: 'CASCADE',})
  @JoinColumn({ name: 'user_id',referencedColumnName: 'id' })
  author: User;
}

• users.service.ts

  async getMyUser(user_id: string) {
    const test = await this.userProfileRepository
      .createqueryBuilder('user_profile')
      .leftJoinAndSelect('user_profile.user','user')
      .leftJoinAndSelect('user.posts','posts')
      .where('user.id = :id',{ id: user_id })
      .getone();

    return test;
  }

  async getUserProfile(user_id: string): Promise<UserProfileResponseDto> {
    try {
      const user = await this.userRepository
        .createqueryBuilder('user')
        .leftJoinAndSelect('user.profile','user_profile')
        .leftJoinAndSelect('user.followers','followers')
        .leftJoinAndSelect('user.following','following')
        .leftJoinAndSelect('user.posts','posts')
        .where('user.id = :id',{ id: user_id })
        .getone();

      if (!user) {
        throw new Error();
      }
      return {
        profile: user.profile,followers: user.followers.length,following: user.following.length,posts: user.posts.length,};
    } catch (err) {
      throw new BadRequestException('Invalid user_id');
    }
  }

在 user_profile 实体中，我使用了 @Afterload，

当我使用 userPrifileRepository(getMyUser) 时，输出很好， 但是如果我使用 userRepository(getUserProfile)，它就不会出现。 （this.user 或 this.user.posts.length 被打印为未定义。）

即使输出很好，也无法保存。 this.post_count = this.user.posts.length

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。

小编邮箱:dio#foxmail.com (将#修改为@）