Nuxt•4w ago

NuxtContent 3, how to change data inside script setup

My code:

const { data: tabs } = await useAsyncData(`usecases`, () => {
    return queryCollection('usecases').all()
})

console.log(tabs.value) // After hot reload returns null

const { data: tabs } = await useAsyncData(`usecases`, () => {
    return queryCollection('usecases').all()
})

console.log(tabs.value) // After hot reload returns null

I would like to take the tabs, use .filter and so on, and then display the processed data on the page. Unfortunately, useAsyncData seems to execute too late. How can this be fixed?

6 Replies

kapa.ai•4w ago

Hi @FoxCode. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- Based on the knowledge sources provided, I can offer some insights on how to address your issue with useAsyncData in Nuxt 3. However, it's important to note that the specific scenario you're describing with NuxtContent is not directly covered in the given information. Nevertheless, I can provide some general guidance on working with useAsyncData in Nuxt 3. The issue you're experiencing where tabs.value returns null after a hot reload might be related to how useAsyncData handles caching and reactivity. Here are a few approaches you can try: 1. Use the watch option: You can use the watch option to re-run your fetching function when certain reactive values change. This might help ensure your data is up-to-date after a hot reload.

   const { data: tabs } = await useAsyncData(`usecases`, () => {
     return queryCollection('usecases').all()
   }, {
     watch: [/* add any reactive dependencies here */]
   })

   const { data: tabs } = await useAsyncData(`usecases`, () => {
     return queryCollection('usecases').all()
   }, {
     watch: [/* add any reactive dependencies here */]
   })

Docs > Getting-started > Data Fetching 2. Use refresh or execute function: If you need to manually refetch the data, you can use the refresh or execute function provided by useAsyncData.

   const { data: tabs, refresh } = await useAsyncData(`usecases`, () => {
     return queryCollection('usecases').all()
   })

   // Later, when you need to refetch:
   await refresh()

   const { data: tabs, refresh } = await useAsyncData(`usecases`, () => {
     return queryCollection('usecases').all()
   })

   // Later, when you need to refetch:
   await refresh()

Docs > Getting-started > Data Fetching 3. Process data in a computed property: Instead of trying to process the data immediately, you can use a computed property to filter and process the data once it's available.

   const { data: tabs } = await useAsyncData(`usecases`, () => {
     return queryCollection('usecases').all()
   })
const processedTabs = computed(() => {
     if (tabs.value) {
       return tabs.value.filter(/* your filter logic */)
     }
     return []
   })

   const { data: tabs } = await useAsyncData(`usecases`, () => {
     return queryCollection('usecases').all()
   })
const processedTabs = computed(() => {
     if (tabs.value) {
       return tabs.value.filter(/* your filter logic */)
     }
     return []
   })

4. Use useLazyAsyncData: If you want the navigation to occur before the data is fetched, you can use useLazyAsyncData instead. This might help if the timing of the data fetching is causing issues.

   const { data: tabs, status } = await useLazyAsyncData(`usecases`, () => {
     return queryCollection('usecases').all()
   })

   // You can then check the status to see if the data is ready

   const { data: tabs, status } = await useLazyAsyncData(`usecases`, () => {
     return queryCollection('usecases').all()
   })

   // You can then check the status to see if the data is ready

Docs > Api > Composables > useLazyAsyncData Remember to handle the case where tabs.value might be null or undefined in your template or subsequent logic. If these approaches don't solve your specific issue with NuxtContent, you might need to consult the NuxtContent documentation or seek more specific help, as the provided knowledge sources don't contain information about NuxtContent specifically. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•4w ago

<@363971301947342848> Kapa.ai is still learning and improving, please let me know how I did by reacting below.

FoxCodeOP•4w ago

So always i should use await refresh() after using useAsyncData? It's a bit unintuitive, but it works

Mittchel•4w ago

@kapa.ai So always i should use await refresh() after using useAsyncData? It's a bit unintuitive, but it works

kapa.ai•4w ago

Let me check the knowledge base for you again. One moment! :books: ---------------------- No, you don't always need to use await refresh() after using useAsyncData. The behavior you're experiencing is indeed unintuitive, and it's not the typical usage pattern. Let me clarify this based on the information from the knowledge sources: 1. By default, useAsyncData should fetch the data automatically when it's called. You typically don't need to call refresh() immediately after using useAsyncData. As stated in the Docs > Api > Composables > useAsyncData: "By default, Nuxt waits until a refresh is finished before it can be executed again." 2. The refresh function is primarily intended for manually refreshing the data when needed, not for initial data fetching. It's useful in scenarios where you want to update the data based on some user action or other events. 3. If you find that you need to call refresh() immediately after useAsyncData to get the data, it might indicate an issue with how the composable is being used or a potential bug. 4. Instead of always using refresh(), you might want to consider using the watch option if you need to react to changes in reactive values:

   const { data, refresh } = await useAsyncData('key', () => fetchData(), {
     watch: [/* your reactive sources */]
   })

   const { data, refresh } = await useAsyncData('key', () => fetchData(), {
     watch: [/* your reactive sources */]
   })

Docs > Getting-started > Data Fetching 5. If you're experiencing issues with data not being available immediately, you might want to handle the 'pending' state in your component:

   const { data, pending } = await useAsyncData('key', () => fetchData())

   const { data, pending } = await useAsyncData('key', () => fetchData())

Then in your template, you can conditionally render based on the pending state. If you're consistently finding that you need to use refresh() immediately after useAsyncData, it would be worth investigating why this is happening. It could be related to how your data fetching function is set up, or there might be some other factor affecting the timing of the data fetching. Remember, the typical usage of useAsyncData should not require an immediate refresh() call. If this behavior persists, it might be worth reporting it as a potential issue to the Nuxt team for further investigation. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•4w ago

<@986261971097780254> Kapa.ai is still learning and improving, please let me know how I did by reacting below.

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NuxtContent 3, how to change data inside script setup

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