在树实体中加载关系：TypeORM

Question

我对在 TypeORM 中使用树实体有很多疑问， 这是我的 commment.entity.ts

@Entity()
@Tree('closure-table')
export class Comments extends BaseEntity {
  @Column({ nullable: false })
  commentBody: string;

  @ManyToOne(() => User, (user) => user.comments)
  @JoinColumn({ name: 'user_id' })
  user: User;

  @ManyToOne(() => Posts, (post) => post.comments)
  @JoinColumn({ name: 'post_id' })
  post: Posts;

  @TreeChildren()
  children: Comments[];

  @TreeParent()
  parent: Comments;

}

我在这里要做的是，用户可以在Post上创建评论

so, user -> 评论（OneToMany 关系） 并发布 -> 评论（OneToMany 关系）

还有我的post.entity.ts

@Entity('posts')
export class Posts extends FakeBaseEntity {
  @Column({ length: 200, nullable: true })
  caption: string;

  @ManyToOne(() => User)
  @JoinColumn({ name: 'author_id' })
  author: User;

  @OneToMany(() => Comments, (comment) => comment.post)
  comments: Comments[];
}

当我试图获取任何 Post 时，我希望所有的 cmets（即所有的孩子）都与他们关联

我的做法有点像这样，

const posts = await this.postsRepo
      .createQueryBuilder('posts')
      .leftJoinAndSelect('posts.author', 'author')
      .leftJoinAndSelect('posts.comments', 'comments')
      .leftJoinAndSelect('comments.children', 'replies') // gets only one children of it
      .leftJoinAndSelect('comments.user', 'commentUser')
      .where('posts.author = :userid', { userid });

通过这个查询我只能得到孩子，即使它有多个孩子

那么，我如何返回与单个评论（即）关联的所有 cmets 以及它的所有子项？

Answer 1

const posts = await this.postsRepo
      .createQueryBuilder('posts')
      .leftJoinAndSelect('posts.author', 'author')
      .leftJoinAndSelect('posts.comments', 'comments')
      .leftJoinAndSelect('comments.children', 'replies') // gets only one children of it
      .leftJoinAndSelect('comments.user', 'commentUser')
      .where('posts.author = :userid', { userid })   .getRawMany();