答：我想明白了。后续代码很旧，GraphQL API有更新。我不得不去他们的API Playground重新编写代码。
我正在使用www.example.com作为后端使用Nextjs制作博客hygraph.com。我试图让它在您点击时可以看到帖子，但它突然停止了对我的工作。如果您确实需要它，这里是我的整个代码：https://github.com/DeviousWings/blog-app
我在这个程序中使用了这个后续程序：https://www.youtube.com/watch?v=HYv55DhgTuA我的混乱似乎是在1：46：40马克。
如果你需要更多的信息，让我知道，我会把一个“编辑”在前面。
下面是错误消息：

Server Error
Error: [line: 1] field 'excerpt' is not defined in 'Post':
 {"response":{"errors":[{"message":
"[line: 1] field 'excerpt' is not defined in 'Post'"}],
"data":null,"extensions":"requestId":"clgir0yw21ztz0blki9cm5z9o"},
"status":400,"headers":{}},"request":

query GetPostDetails($slug : String!) {
    post(where: {slug: $slug}) {

      author{
        name
        bio
        photo {
          url
        }
      }
      createdAt
      slug
      title
      excerpt
      featuredImage {
        url
      }
      categories {
        name
        slug
      }
      content {
        raw
      }
    }
  }
`;
 ",
"variables":{"slug":"space-cockpit"}}}

下面是混乱的根源：

services\index.js (109:17) @ async getPostDetails

  107 | 
  108 | 
> 109 | const result = await request(graphqlAPI, query, { slug });
      |               ^
  110 | 
  111 | return result.post;
  112 | };

以下是源代码所在的完整代码（blog-app\services\index.js）：

import { request, gql } from "graphql-request";

const graphqlAPI = process.env.NEXT_PUBLIC_GRAPHCMS_ENDPOINT;

export const getPosts = async () => {
    const query = gql
    `query MyQuery {
      postsConnection {
        edges {
          node {
            author {
              bio
              name
              id
              photo {
                url
              }
            }
            createdAt
            slug
            title
            exerpt
            featuredImage {
              url
            }
            categories {
              name
              slug
            }
          }
        }
      }
    }
    
    `;

    const result = await request(graphqlAPI, query)

    return result.postsConnection.edges;
};

export const getCategories = async () => {
  const query = gql`
    query GetGategories {
        categories {
          name
          slug
        }
    }
  `;
  const result = await request(graphqlAPI, query);

  return result.categories;
  }
export const getRecentPosts = async () => {
  const query = gql `
  query GetPostDetails() {
    posts(
      orderBy: createdAt_ASC
      last: 3
      ) {
        title
        featuredImage {
          url
        }
        createdAt
        slug
      }
  }
  `

  const result = await request(graphqlAPI, query)

  return result.posts;
};

export const getPostDetails = async (slug) => {
  const query = gql`
  query GetPostDetails($slug : String!) {
    post(where: {slug: $slug}) {

      author{
        name
        bio
        photo {
          url
        }
      }
      createdAt
      slug
      title
      excerpt
      featuredImage {
        url
      }
      categories {
        name
        slug
      }
      content {
        raw
      }
    }
  }
`;

  

  const result = await request(graphqlAPI, query, { slug });

  return result.post;
};

export const getSimilarPosts = async (categories, slug) => {
  const query = gql`
    query GetPostDetails($slug: String!, $categories: [String!]) {
      posts(
        where: {slug_not: $slug, AND: {categories_some: {slug_in: $categories}}}
        last: 3
      ) {
        title
        featuredImage {
          url
        }
        createdAt
        slug
      }
    }
  `;
  const result = await request(graphqlAPI, query, { slug, categories });

  return result.posts;
};

我的模特：
CommentModel
Post Model
我不擅长调试，但我的console.log没有拾取任何东西。