examples/cms-prepr/pages/posts/[slug].js

import { useRouter } from "next/router";
import ErrorPage from "next/error";
import Container from "@/components/container";
import PostBody from "@/components/post-body";
import MoreStories from "@/components/more-stories";
import Header from "@/components/header";
import PostHeader from "@/components/post-header";
import SectionSeparator from "@/components/section-separator";
import Layout from "@/components/layout";
import { getAllPostsWithSlug, getPostAndMorePosts } from "@/lib/api";
import PostTitle from "@/components/post-title";
import Head from "next/head";
import { CMS_NAME } from "@/lib/constants";

export default function Post({ post, morePosts, preview }) {
  const router = useRouter();
  if (!router.isFallback && !post?._slug) {
    return <ErrorPage statusCode={404} />;
  }
  return (
    <Layout preview={preview}>
      <Container>
        <Header />
        {router.isFallback ? (
          <PostTitle>Loading…</PostTitle>
        ) : (
          <>
            <article>
              <Head>
                <title>
                  {post.title} | Next.js Blog Example with {CMS_NAME}
                </title>
                <meta property="og:image" content={post.cover[0].url} />
              </Head>
              <PostHeader
                title={post.title}
                coverImage={post.cover[0].url}
                date={post._publish_on}
                author={post.authors[0]}
              />
              <PostBody content={post.content} />
            </article>
            <SectionSeparator />
            {morePosts.length > 0 && <MoreStories posts={morePosts} />}
          </>
        )}
      </Container>
    </Layout>
  );
}

export async function getStaticProps({ params, preview = false }) {
  const { post, morePosts } = await getPostAndMorePosts(params.slug, preview);

  return {
    props: {
      preview,
      post,
      morePosts,
    },
  };
}

export async function getStaticPaths() {
  const allPosts = await getAllPostsWithSlug();

  const paths = allPosts.map((post) => ({
    params: { slug: post._slug },
  }));

  return {
    paths,
    fallback: true,
  };
}