javascript - How to add create an entity inside another entity (NestJS)?

Question

I have two entities: User and Photo with relationship OneToMany. One user can have many photos. User:

@Entity('users')
export class User {
  @PrimaryGeneratedColumn()
  id: number;

  @Column()
  firstName: string;

  @Column()
  lastName: string;

  @Exclude()
  @Column()
  password: string;

  @Column({ default: '' })
  avatar: string;

  @OneToMany(() => Photo, photo => photo.user, { cascade: true })
  photos: Photo[];
}

And Photo:

@Entity('photos')
export class Photo {
  @PrimaryGeneratedColumn()
  id: number;

  @Column()
  url: string;

  @Column({default: ""})
  description: string;
  
  @ManyToOne(() => User, user => user.photos)
  user: User;
}

So, my question is: how can i add new photo to specific user? I tried to do something like this, but it doesn't work as expected.

@Patch(':id/photos')
  addPhoto(@Param('id') id: number, @Body() createPhotoDto: CreatePhotoDto){
    return this.userService.createImage(id, createPhotoDto);
  }



async createImage(id: number, createPhotoDto: CreatePhotoDto) {
    const user = await this.usersRepository.findOne(id);
    const newUser = await this.usersRepository.preload({
      id: +id,
      photos: [...user.photos, createPhotoDto]
    });

    return this.usersRepository.save(newUser);
  }

Answer 1

What I got from the CreatePhotoDto that you save the image and bind it with the user,
one of the easiest way to do it, First declare you imageRepository in your service then :

    async createImage(id: number, createPhotoDto: CreatePhotoDto) {
     const user = await this.usersRepository.findOne(id);
      
     return   await this.imageRepository.save({url:createPhotoDto.url,user:user});
    // if you want to return the user with the image added you make another find with the relation  exp:
   //  return  await this.usersRepository.findOne(id,{ relations: ['photos'],});
    }