NestJS Typeorm 保存一对多关系

Question

我正在尝试以一对多关系保存 Nestjs 项目中的对象数组。

前端给了我这样的东西来使用：

[
{
"actor":"actorname",
"role":"actorrole"
},
{
"actor":"actorname2",
"role":"actorrole2"
}
]

为了保存所有这些，我创建了一个电影实体和一个演员实体，如下所示：

演员.实体.ts

//imports
@Entity()
export class Actor {
    @PrimaryGeneratedColumn()
    id: number;

    @ManyToOne(() => Movie, (movie) => movie.actors)
    movieId: number;

    @Column()
    role: string;

    @Column()
    actor: string;
}

电影.实体.ts

//imports
@Entity()
export class Movie {
    @PrimaryGeneratedColumn()
    id: number;

    //more stuff

    @OneToMany(() => Actor, (actor) => actor.movieId)
    actors: Actor[];
}

现在的问题是，我的前端将 JSON 数据作为整个字符串返回，所以我必须首先

JSON.parse()

并在我的 dto 中接受它，如下所示：

//imports
export class CreateMovieDto {
    actorsArray: string;
}

现在我的问题是保存 json 数据

//imports
@EntityRepository(Movie)
export class MoviesRepository extends Repository<Movie> {
    async createMovie(
        createMovieDto: CreateMovieDto,
        fileName: string,
        filePath: string,
    ) {
        const movie = this.create(createMovieDto);

        let actorsArray = JSON.parse(createMovieDto.actorsArray);
        //how do i save it now together with the movie?
        
        try {
            //await this.save(movie); disabled for now
            return movie;
        } catch (error) {
            if ((error.code = 'ER_DUP_ENTRY')) {
                console.log(error);
                throw new ConflictException('Movie already exists');
            } else {
                console.log(error);
                throw new InternalServerErrorException();
            }
        }
    }

Answer 1

你应该做这样的事情

//现在如何将其与电影一起保存？

const actorsEntities = await Promise.all( actorsArray.map(async (actor) => {
          const actorEntity = new Actor(actor);

          // Save the image entity to the database
          await this.actorsRepository.save(actorEntity);

          return actorEntity;
        }),
      );

      movie.actors = actorsEntities;
  );

this.save(movie);