如何使用GraphQL Yoga执行多个嵌套查询(GET请求)？

const { GraphQLServer } = require('graphql-yoga');

// 定义schema
const typeDefs = `
  type Query {
    user(id: ID!): User
  }

  type User {
    id: ID!
    name: String!
    posts: [Post]
  }

  type Post {
    id: ID!
    title: String!
  }
`;

// 定义resolver
const resolvers = {
  Query: {
    user: (parent, { id }, context, info) => {
      // 根据id查询用户信息
      const user = getUserById(id);

      return user;
    },
  },
  User: {
    posts: (parent, args, context, info) => {
      // 根据用户id查询用户的所有帖子
      const posts = getPostsByUserId(parent.id);

      return posts;
    },
  },
};

// 创建GraphQL服务器
const server = new GraphQLServer({ typeDefs, resolvers });

// 启动服务器
server.start({ port: 4000 }, () => {
  console.log('Server is running on http://localhost:4000');
});