How can I clear the cache for GetStaticPaths in NextJs and remove a dynamic route?

Question

How can I clear the cache for GetStaticPaths in NextJs and remove a dynamic route?

This question may seem basic, but I can't seem to find the answer anywhere online.

Currently, I am diving into NextJs (using TypeScript) and I have successfully set up a site with dynamic routes, SSR, and incremental regeneration deployed on Vercel. Below is an example of the code in my dynamic route handler for GetStaticProps and GetStaticPaths:

export const getStaticPaths: GetStaticPaths = async () => {
    const routes = new CmsHelper().GetRoutes();

    const paths = (await routes).items.map((item, index, items) => {
        return item.fields.urlPath;
    })

    return {
        paths: paths,
        fallback: 'blocking',
    };
}

export const getStaticProps: GetStaticProps = async (context) => {
    const urlParts = context.params?.url as string[] || [];
    const urlPath = `/${urlParts.join('/')}`;
    const article = await new CmsHelper().GetArticle(urlPath);
    return {
        props: {
            article
        },
        revalidate: 10,
    }
}

If I request a new path added after build time in the CMS, it regenerates successfully and shows the page.

Everything seems fine so far.

However, if I unpublish a route in the CMS... it still shows up in the app unless I rebuild and redeploy (in development).

So here's my question: how can I dynamically remove a dynamic route from NextJs' GetStaticPaths cache?

I know that GetStaticProps is called at most once every 10 seconds due to the revalidate setting. But as far as I understand, GetStaticPaths is only triggered when a request comes in from a route that is not already cached(?).

In essence, for integration with a headless CMS, how can I handle unpublishing or renaming pages in NextJs without needing a rebuild/deploy?

Thank you in advance!

typescript next.js contentful

Answer 1

Answer №1

Perhaps consider trying out this method detailed here.

Additionally, I have included the code here for your reference.

// pages/blog/[slug].js

import {useRouter} from 'next/router'
import DefaultErrorPage from 'next/error'

export async function getStaticProps({ params }) {
  // fetch data from CMS through params
  const post = await getBlogItem(params.slug)
  return {
    props: {
      post
    }
  }
}

export async function getStaticPaths() {
  return {
    fallback: true,
    paths: []
  }
}

export default function MyPage({post}) {
  const router = useRouter()

  if(router.isFallback) {
     return <h1>Loading...</h1>
  }

  // This includes setting the noindex header because static files always return a status 200 but the rendered not found page page should obviously not be indexed
  if(!post) {
    return <>
      <Head>
        <meta name="robots" content="noindex">
      </Head>
      <DefaultErrorPage statusCode={404} />
    </>
  }

  return <h1>{post.title}</h1>
}

Instead of clearing the cache, perhaps handle scenarios where the fetched content is marked as "unpublished," and in that case, display a 404 Not Found page or any other desired outcome.

You can use something like this:

export async function getStaticProps(context) {

    const {params: {id}} = context

    let data;
    try {
        data = await httpClient...
    } catch (err) {
        if (not err is caused due to content being unpublished){
            // re throw it
            throw err;
        }
        // Else handle it gracefully
        data = null;
    }

    return {
        props: {
            data,
        },
        revalidate: 1
    };
}

Then, implement this on your view component:

export default function Data(props) {
    const {data} = props;

    const router = useRouter()

    // If the page is not yet generated, this will be displayed initially until getStaticProps() finishes running
    if (router.isFallback) {
        return <div>Loading...</div>
    }

    if (!data) {
        return (
            <>
                <Head>
                    <meta name="robots" content="noindex"/>
                </Head>
                <DefaultErrorPage statusCode={404}/>
            </>
        )
    }

    return <DataView {...data} />;

}

Answer 2

Perhaps consider trying out this method detailed here.

Additionally, I have included the code here for your reference.

// pages/blog/[slug].js

import {useRouter} from 'next/router'
import DefaultErrorPage from 'next/error'

export async function getStaticProps({ params }) {
  // fetch data from CMS through params
  const post = await getBlogItem(params.slug)
  return {
    props: {
      post
    }
  }
}

export async function getStaticPaths() {
  return {
    fallback: true,
    paths: []
  }
}

export default function MyPage({post}) {
  const router = useRouter()

  if(router.isFallback) {
     return <h1>Loading...</h1>
  }

  // This includes setting the noindex header because static files always return a status 200 but the rendered not found page page should obviously not be indexed
  if(!post) {
    return <>
      <Head>
        <meta name="robots" content="noindex">
      </Head>
      <DefaultErrorPage statusCode={404} />
    </>
  }

  return <h1>{post.title}</h1>
}

Instead of clearing the cache, perhaps handle scenarios where the fetched content is marked as "unpublished," and in that case, display a 404 Not Found page or any other desired outcome.

You can use something like this:

export async function getStaticProps(context) {

    const {params: {id}} = context

    let data;
    try {
        data = await httpClient...
    } catch (err) {
        if (not err is caused due to content being unpublished){
            // re throw it
            throw err;
        }
        // Else handle it gracefully
        data = null;
    }

    return {
        props: {
            data,
        },
        revalidate: 1
    };
}

Then, implement this on your view component:

export default function Data(props) {
    const {data} = props;

    const router = useRouter()

    // If the page is not yet generated, this will be displayed initially until getStaticProps() finishes running
    if (router.isFallback) {
        return <div>Loading...</div>
    }

    if (!data) {
        return (
            <>
                <Head>
                    <meta name="robots" content="noindex"/>
                </Head>
                <DefaultErrorPage statusCode={404}/>
            </>
        )
    }

    return <DataView {...data} />;

}

Answer 3

Answer №2

My issue was somewhat similar, yet slightly different: I encountered difficulties deploying my project's generated URL from the data, particularly when attempting to add new URLs as the data in the database changed.

The solution to my dilemma lay in realizing that I had set the fallback option to false within my getStaticPaths method. Once I switched it to true, the deployment process in production mirrored that of my local development environment.

I noticed that you're providing a string value for your fallback property. Perhaps consider using a boolean value instead, which is outlined in more detail here: https://nextjs.org/docs/basic-features/data-fetching#the-fallback-key-required

Answer 4

My issue was somewhat similar, yet slightly different: I encountered difficulties deploying my project's generated URL from the data, particularly when attempting to add new URLs as the data in the database changed.

The solution to my dilemma lay in realizing that I had set the fallback option to false within my getStaticPaths method. Once I switched it to true, the deployment process in production mirrored that of my local development environment.

I noticed that you're providing a string value for your fallback property. Perhaps consider using a boolean value instead, which is outlined in more detail here: https://nextjs.org/docs/basic-features/data-fetching#the-fallback-key-required

Answer 5

Answer №3

Experience the power of On-Demand Incremental Static Regeneration with the latest release of Next.js 12.2 in the summer of 2022. This feature allows you to update generated pages on demand by simply publishing changes in your headless CMS and utilizing its webhook functionalities.

// pages/api/revalidate.js

export default async function handler(req, res) {
  // Verify the secret token for authentication
  if (req.query.secret !== process.env.MY_SECRET_TOKEN) {
    return res.status(401).json({ message: 'Invalid token' })
  }

  try {
    // Provide the actual path that needs revalidation
    // For example, use "/blog/post-1" instead of rewritten paths like "/blog/[slug]"
    await res.revalidate('/path-to-revalidate')
    return res.json({ revalidated: true })
  } catch (err) {
    // In case of an error, Next.js will continue to display the last successfully generated page
    return res.status(500).send('Error revalidating')
  }
}

Explore more about using On-Demand Revalidation here

Answer 6

Experience the power of On-Demand Incremental Static Regeneration with the latest release of Next.js 12.2 in the summer of 2022. This feature allows you to update generated pages on demand by simply publishing changes in your headless CMS and utilizing its webhook functionalities.

// pages/api/revalidate.js

export default async function handler(req, res) {
  // Verify the secret token for authentication
  if (req.query.secret !== process.env.MY_SECRET_TOKEN) {
    return res.status(401).json({ message: 'Invalid token' })
  }

  try {
    // Provide the actual path that needs revalidation
    // For example, use "/blog/post-1" instead of rewritten paths like "/blog/[slug]"
    await res.revalidate('/path-to-revalidate')
    return res.json({ revalidated: true })
  } catch (err) {
    // In case of an error, Next.js will continue to display the last successfully generated page
    return res.status(500).send('Error revalidating')
  }
}

Explore more about using On-Demand Revalidation here

How can I clear the cache for GetStaticPaths in NextJs and remove a dynamic route?

Answer №1

Answer №2

Answer №3

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