使用type-graphql typeorm和dataloader处理一对多的最佳方式

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

  @Column()
  name: string;

  @OneToMany(() => Post, post => post.user)
  posts: Post[];
}

@Entity()
class Post {
  @PrimaryGeneratedColumn()
  id: number;

  @Column()
  title: string;

  @ManyToOne(() => User, user => user.posts)
  user: User;
}

@Resolver(User)
class UserResolver {
  @Query(() => User)
  async user(@Arg("id") id: number): Promise<User> {
    // 查询用户信息
  }

  @FieldResolver()
  async posts(@Root() user: User): Promise<Post[]> {
    // 查询用户的帖子信息
  }
}

@Resolver(Post)
class PostResolver {
  @Query(() => Post)
  async post(@Arg("id") id: number): Promise<Post> {
    // 查询帖子信息
  }

  @FieldResolver()
  async user(@Root() post: Post): Promise<User> {
    // 查询帖子的用户信息
  }
}

@Resolver(User)
class UserResolver {
  @FieldResolver()
  async posts(@Root() user: User, @Ctx() { postLoader }: MyContext): Promise<Post[]> {
    return postLoader.load(user.id);
  }
}

// 在GraphQL上下文中创建dataloader实例
const createContext = (): MyContext => {
  return {
    postLoader: new DataLoader<number, Post[]>(async (userIds) => {
      // 批量查询用户的帖子信息
    }),
  };
};

@Resolver(User)
class UserResolver {
  @Query(() => User)
  async user(@Arg("id") id: number): Promise<User> {
    return await User.findOne(id);
  }
}

@Resolver(Post)
class PostResolver {
  @Query(() => Post)
  async post(@Arg("id") id: number): Promise<Post> {
    return await Post.findOne(id);
  }
}