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我正在尝试 Next.js 并构建一个小应用程序，该应用程序从安装了 GraphQL 的无头 WordPress 应用程序中获取帖子。然后我使用 Apollo/Client 来获取 GraphQL 内容：

阿波罗客户端.js

import { ApolloClient, InMemoryCache } from "@apollo/client";

const client = new ApolloClient({
  uri: process.env.WORDPRESS_GRAPHQL_ENDPOINT,
  cache: new InMemoryCache(),
});

export default client;

在索引中，我抓住了帖子：

index.js

import Head from "next/head";
import styles from "../styles/Home.module.css";

import { gql } from "@apollo/client";
import Link from "next/link";
import client from "../apollo-client";

function Home(props) {
  const { posts } = props;
  return (
    <div className={styles.container}>
      <Head>
        <title>Wordpress blog posts</title>
        <meta
          name="description"
          content="Wordpress blog posts with Apollo Client"
        />
        <link rel="icon" href="/favicon.ico" />
      </Head>

      <main className={styles.main}>=
        <div className={styles.grid}>
          {posts.map((post) => (
            <a
              key={post.node.databaseId}
              href={`/blog/${post.node.slug}`}
              className={styles.card}
            >
              <h2>{post.node.title}</h2>
              <div dangerouslySetInnerHTML={{ __html: post.node.excerpt }} />
            </a>
          ))}
        </div>
      </main>
    </div>
  );
}

export async function getStaticProps() {
  const { data } = await client.query({
    query: gql`
      query Posts {
        posts {
          edges {
            node {
              title
              databaseId
              slug
              excerpt(format: RENDERED)
            }
          }
        }
      }
    `,
  });

  if (data.posts.edges === 0) {
    return { notFound: true };
  }

  return {
    props: {
      posts: data.posts.edges,
    },
    revalidate: 10,
  };
}

export default Home;

然后对于单个帖子页面：

/blog/[slug].js

import Link from "next/link";
import { gql } from "@apollo/client";
import client from "../../apollo-client";

export default function BlogPage(props) {
  const { post } = props;

  if (!post) {
    return <p>Loading...</p>;
  }

  return (
    <div>
      <h1>{post.title}</h1>
      <div dangerouslySetInnerHTML={{ __html: post.content }} />
      <Link href="/">
        <a>&larr; back to home</a>
      </Link>
    </div>
  );
}

export async function getStaticProps({ params }) {
  const { slug } = params;
  const result = await client.query({
    query: gql`
      query GetWordPressPostBySlug($id: ID!) {
        post(id: $id, idType: SLUG) {
          title
          content
        }
      }
    `,
    variables: { id: slug },
  });

  if (!result.data.post) {
    return { notFound: true };
  }

  return {
    props: {
      post: result.data.post,
    },
    revalidate: 10,
  };
}

export async function getStaticPaths() {
  const result = await client.query({
    query: gql`
      query GetWordPressPosts {
        posts {
          nodes {
            slug
          }
        }
      }
    `,
  });

  return {
    paths: result.data.posts.nodes.map(({ slug }) => {
      return {
        params: { slug },
      };
    }),
    fallback: true,
  };
}

添加新帖子时它可以工作，一旦我删除它，它就不会被删除。这发生在做npm run dev和npm run build然后npm start

我可能在 ISR 和重新验证的工作方式上遇到了问题。或者我的代码中可能遗漏了什么？任何帮助，将不胜感激。

- 编辑 -

同时，在 Stackoverflow 和 Next.js github 存储库上还有几个线程，与我正在经历的有关。相关页面：

Next.js 不删除 CMS 中删除的动态页面

https://github.com/vercel/next.js/issues/25470

Next.js ISR 页面在 CMS 中删除后未删除

如何清除 NextJs GetStaticPaths 缓存/“取消发布”动态路由？

https://github.com/vercel/next.js/discussions/18967

4

1 回答 1

2

我不确定这是否符合您的用例，但在我从事的一个项目中，如果源数据被删除，我们会返回 404。

export async function getStaticPaths() {
  // Get the paths we want to pre-render based on posts
  // We do not need to generate anything during build
  return {
    paths: [],
    fallback: true,
  };
}

export async function getStaticProps({ params: { slug } }) {
  // Run your data fetching code here
  try {
    const data = await getData(slug);
    return {
      props: { data, slug },
      revalidate: 30,
      notFound: !data,
    };
  } catch (e) {
    return {
      props: { data: null, slug },
      revalidate: 30,
      notFound: true,
    };
  }
}

文档：https ://nextjs.org/blog/next-10#redirect-and-notfound-support-for-getstaticprops--getserversideprops

于 2021-06-19T06:03:10.790 回答