How to attach a revalidateTag to a server action call
#How to attach a revalidateTag to a server action call
mossy cobalt
silk shellBOT
Hi @mossy cobalt. 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 attach a revalidateTag to a server action call to revalidate data associated with a specific cache tag. This is useful for scenarios where you want to update your cached data without waiting for a revalidation period to expire.
Here is an example of how you can use revalidateTag in a server action:
import { revalidateTag } from 'next/cache'
async function revalidate() {
'use server'
revalidateTag('blog-posts')
}
In this example, revalidateTag('blog-posts') is used to revalidate all data associated with the 'blog-posts' tag.
You can also use revalidateTag in a Route Handler or a Server Action. For example, you can set a tag when fetching data:
fetch(`<https://...`,> { next: { tags: ['a', 'b', 'c'] } })
Then, call revalidateTag with a tag to purge the cache entry:
revalidateTag('a')
In the context of a Server Action, you can use revalidateTag to revalidate data after a user action, such as a form submission. This will invalidate the Router Cache for the associated route.
For more details, you can refer to the Next.js documentation (https://nextjs.org/docs/app/api-reference/functions/revalidateTag).
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mossy cobalt
@silk shell How do I associate data to a specific cache tag
silk shellBOT
Let me check the knowledge base for you. One moment! :books:
In Next.js, you can associate data to a specific cache tag when using fetch or unstable_cache. This is done by tagging cache entries with one or more tags. Here's an example of how you can do this:
fetch(`<https://...`,> { next: { tags: ['a', 'b', 'c'] } })
In this example, the fetch request is associated with the cache tags 'a', 'b', and 'c'.
You can also use multiple tags for a single fetch request. This allows you to revalidate or purge multiple cache entries associated with these tags using the revalidateTag function.
For more details, you can refer to the Next.js documentation (https://nextjs.org/docs/app/building-your-application/caching).
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
mossy cobalt
@silk shell when using unstable_cache i conjunction with revalidateTag(), where should I put the tag in unstable_cache that will go in revalidateTag() ?
silk shellBOT
Let me check the knowledge base for you. One moment! :books:
When using unstable_cache in conjunction with revalidateTag(), you can specify the tags in the options object of the unstable_cache function. Here's an example:
import { unstable_cache } from 'next/cache'
export default async function Page() {
const cachedData = await unstable_cache(
async () => {
const data = await db.query('...')
return data
},
['cache-key'],
{
tags: ['a', 'b', 'c'],
revalidate: 10,
}
)()
}
In this example, the unstable_cache function is used to cache data with the tags 'a', 'b', and 'c'. The revalidate option is set to 10, which means the data will be revalidated every 10 seconds.
Then, you can use revalidateTag() to revalidate the data associated with a specific tag. For example:
revalidateTag('a')
This will revalidate all data associated with the tag 'a'.
Please note that unstable_cache is an experimental API and it's not recommended to use it in production as it's still being developed.
For more details, you can refer to the Next.js documentation (https://nextjs.org/docs/app/building-your-application/caching).
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
mossy cobalt
@silk shell what is the difference between ['cache-key'] and tags?
silk shellBOT
Let me check the knowledge base for you. One moment! :books:
In the context of the unstable_cache function in Next.js, ['cache-key'] and tags serve different purposes.
['cache-key'] is the key used to store and retrieve the data from the cache. It's unique to each cache entry. When you want to cache some data, you provide this key, and the unstable_cache function uses it to save the data in the cache. Later, you can retrieve the cached data using the same key.
Here's an example:
const cachedData = await unstable_cache(
async () => {
const data = await db.query('...')
return data
},
['cache-key'], // This is the cache key
{
tags: ['a', 'b', 'c'],
revalidate: 10,
}
)()
On the other hand, tags are used to group multiple cache entries together. This is useful when you want to revalidate or invalidate multiple cache entries at once. For example, you might have different cache entries for different blog posts, but they all have a common tag 'blog'. You can then revalidate all blog posts at once by calling revalidateTag('blog').
For more details, you can refer to the Next.js documentation (https://nextjs.org/docs/app/building-your-application/caching).
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
mossy cobalt
@silk shell revalidatePath() is causing a continuous rerender of the client component. The url is http://localhost:3000/v/add?v=q0njmcmcu412w1741yn9uc98
silk shellBOT
Let me check the knowledge base for you. One moment! :books:
Based on the provided extracts, there's no specific information about the revalidatePath() function causing a continuous re-render of the client component.
However, continuous re-rendering usually happens when there's a state change in the component or its parent component. If revalidatePath() is causing a state change, it could lead to continuous re-rendering.
To avoid this, you should ensure that revalidatePath() is not causing unnecessary state changes. If you're using it inside a useEffect hook, make sure to include all dependencies in the dependency array to avoid unnecessary re-renders.
If the problem persists, you might want to check the official Next.js documentation or their community support for more specific guidance.
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
mossy cobalt
@silk shell does revalidatePath() work with static pages?
silk shellBOT
Let me check the knowledge base for you. One moment! :books: