@RelationId

@RelationId

• @RelationId((엔티티: 엔티티타입) =>누구의 relation id인지 명시)

• relation의 id를 로드 함

• Ex)

  @Entity()
  export class Post {
    @ManyToOne((type) => Category)
    category: Category;

    @RelationId((post: Post) => post.category) // you need to specify target relation
    categoryId: number;
  }

https://github.com/typeorm/typeorm/blob/master/docs/decorator-reference.md#relationid