how to provide cache and revalidate a server action
#how to provide cache and revalidate a server action
gilded delta
spring gateBOT
Hi @gilded delta. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:
In Next.js, you can provide caching and revalidation in a server action using the fetch function and the revalidatePath or revalidateTag functions from the next/cache module.
When using fetch, you have the option to tag cache entries with one or more tags. This is done by passing an options object with a next property that contains a tags array. Here's an example:
export default async function Page() {
const res = await fetch('<https://...',> { next: { tags: ['collection'] } })
const data = await res.json()
// ...
}
In the example above, the fetch request is tagged with collection (source (https://nextjs.org/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating)).
To revalidate the data, you can use revalidatePath or revalidateTag in a server action. revalidatePath invalidates an entire route segment, while revalidateTag invalidates a specific data fetch with a cache tag. Here are examples of how to use them:
// Using revalidatePath
'use server'
import { revalidatePath } from 'next/cache'
export default async function submit() {
await submitForm()
revalidatePath('/')
}
// Using revalidateTag
'use server'
import { revalidateTag } from 'next/cache'
export default async function submit() {
await addPost()
revalidateTag('posts')
}
In the first example, revalidatePath('/') is used to invalidate the entire route segment. In the second example, revalidateTag('posts') is used to invalidate the data fetch tagged with posts (source (https://nextjs.org/docs/app/building-your-application/data-fetching/forms-and-mutations)).
Remember that revalidating or opting out of the Data Cache will invalidate the Full Route Cache, as the render output depends on data. To immediately invalidate the Data Cache and Router cache, you can use revalidatePath or revalidateTag in a Server Action (source (https://nextjs.org/docs/app/building-your-application/caching)).
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
gilded delta
how to do it to a single post for example I have a server action which gets a post but if the cache is available then get the cache
@spring gate how to do it to a single post for example I have a server action which gets a post but if the cache is available then get the cache
spring gateBOT
Let me check the knowledge base for you. One moment! :books:
To cache and revalidate a single post in Next.js, you can use the fetch function with the next property to tag the cache entry. Then, you can use revalidateTag from the next/cache module to revalidate the data when needed.
Here's an example of how you might do this:
export default async function Page() {
const res = await fetch('<https://.../post/1',> { next: { tags: ['post-1'] } });
const data = await res.json();
// ...
}
In this example, the fetch request is tagged with post-1. This tag can be used to revalidate the data for this specific post.
When you want to revalidate the data for this post, you can use revalidateTag in a server action:
'use server'
import { revalidateTag } from 'next/cache'
export default async function updatePost() {
await updatePostData()
revalidateTag('post-1')
}
In this example, revalidateTag('post-1') is used to invalidate the data fetch tagged with post-1. This will cause Next.js to re-fetch the data for this post the next time it is requested (source (https://nextjs.org/docs/app/building-your-application/data-fetching/forms-and-mutations)).
Remember that revalidating or opting out of the Data Cache will invalidate the Full Route Cache, as the render output depends on data. To immediately invalidate the Data Cache and Router cache, you can use revalidatePath or revalidateTag in a Server Action (source (https://nextjs.org/docs/app/building-your-application/caching)).
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
gilded delta
@spring gate how to not cache a server action if the request didn't succeed
spring gateBOT
Let me check the knowledge base for you. One moment! :books:
In Next.js, if an error is thrown while attempting to revalidate data, the last successfully generated data will continue to be served from the cache. On the next subsequent request, Next.js will retry revalidating the data (source (https://nextjs.org/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating)).
If you want to opt out of caching for a specific fetch request when it fails, you can handle the error in your fetch request and set the cache option to no-store. Here's an example:
try {
const res = await fetch('<https://...',> { cache: 'no-store' });
if (!res.ok) {
throw new Error('Network response was not ok');
}
const data = await res.json();
// ...
} catch (error) {
console.error('Fetch Error:', error);
}
In this example, if the fetch request fails (i.e., the response is not ok), an error is thrown. Because the cache option is set to no-store, the fetch request will not be cached (source (https://nextjs.org/docs/app/building-your-application/caching)).