To generate metadata for a particular page or collection item, we can use the BaseHub SDK to query the metadata, then use Next.js’ generateMetadata function to generate the metadata. For example, here’s how we’ve wired up the metadata for the blog post page, using the createMetadata function from the SEO package:
apps/web/app/blog/[slug]/page.tsx
import { blog } from '@repo/cms';

type BlogPostProperties = {
  readonly params: Promise<{
    slug: string;
  }>;
};

export const generateMetadata = async ({
  params,
}: BlogPostProperties): Promise<Metadata> => {
  const { slug } = await params;
  const post = await blog.getPost(slug);

  if (!post) {
    return {};
  }

  return createMetadata({
    title: post._title,
    description: post.description,
    image: post.image.url,
  });
};
blog.getPost is a function that abstracts the logic of fetching the blog post from the CMS. Under the hood, it uses the BaseHub SDK to fetch the blog post from the CMS:
packages/cms/index.ts
import { basehub, fragmentOn } from 'basehub';

const postFragment = fragmentOn('PostsItem', {
  _slug: true,
  _title: true,
  authors: {
    _title: true,
    avatar: imageFragment,
    xUrl: true,
  },
  body: {
    plainText: true,
    json: {
      content: true,
      toc: true,
    },
    readingTime: true,
  },
  categories: {
    _title: true,
  },
  date: true,
  description: true,
  image: imageFragment,
});

export const blog = {
  // ...

  postQuery: (slug: string) => ({
    blog: {
      posts: {
        __args: {
          filter: {
            _sys_slug: { eq: slug },
          },
        },
        items: postFragment,
      },
    },
  }),

  getPost: async (slug: string) => {
    const query = blog.postQuery(slug);
    const data = await basehub().query(query);

    return data.blog.posts.items.at(0);
  },
};