#nextjs data fetching

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polar harbor
#

how to handle datafetching with filter

silver willowBOT
#

Hi @polar harbor. 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 handle data fetching with filters by passing the filter parameters to your data fetching function. Here's an example from a GitHub issue related to Next.js:

let filters: TransactionListFilters = {
    order: order as 'ASC' | 'DESC',
};
if (fromDate) {
  filters['from_date'] = fromDate;
}
if (toDate) {
  filters['to_date'] = toDate;
}
if (transferType) {
  filters['trans_type'] = transferType as TransType;
}
if (status) {
  filters['status'] = status as Status;
}
if (beneficiary) {
  filters['beneficiary_id'] = beneficiary;
}

// Data fetching 
const transactions = await transactionService.getTransactionList(filters);

// data fetching
const beneficiaries = await beneficiaryService.getBeneficiaryList();

In this example, a filters object is created and populated based on certain conditions. This filters object is then passed to the getTransactionList function of the transactionService to fetch the data based on the filters.

For client-side data fetching, you can use libraries like SWR or React Query. These libraries provide their own APIs for caching, revalidating, and mutating data. For example, using SWR to fetch data periodically on the client:

"use client"
 
import useSWR from 'swr'
import fetcher from '@/utils/fetcher'
 
export default function PollingComponent {
  // Polling interval set to 2000 milliseconds
  const { data } = useSWR('/api/data', fetcher, { refreshInterval: 2000 });
 
  return '...'
}

In this example, the useSWR hook is used to fetch data from the /api/data endpoint every 2000 milliseconds. The fetcher function is used to fetch and parse the data.

For more information on data fetching in Next.js, you can check out the official documentation (https://nextjs.org/docs/pages/building-your-application/data-fetching).

#

@polar harbor kapa.ai is still learning and improving, please let us know how it did by reacting below

polar harbor
#

@silver willow how about in nextjs app router server components

silver willowBOT
#

Let me check the knowledge base for you. One moment! :books:

#

In Next.js, Server Components are used to write UI that can be rendered and optionally cached on the server. They are used by default in the app directory, which works alongside the pages directory. This allows you to opt some routes of your application into the new behavior while keeping other routes in the pages directory for previous behavior.

When it comes to data fetching, Server Components can be used to fetch data on the server side. Here's an example:

export default async function Page() {
  // This fetch will run on the server during `next build`
  const res = await fetch('<https://api.example.com/...'>)
  const data = await res.json()
 
  return <main>...</main>
}

In this example, the fetch function is used to fetch data from an API during the build process. The fetched data is then used to render the component.

For role-based access, Server Components can be used to conditionally render components based on the user's role. Here's an example:

import { verifySession } from '@/app/lib/dal'
 
export default function Dashboard() {
  const session = await verifySession()
  const userRole = session?.user?.role // Assuming 'role' is part of the session object
 
  if (userRole === 'admin') {
    return <AdminDashboard />
  } else if (userRole === 'user') {
    return <UserDashboard />
  } else {
    redirect('/login')
  }
}

In this example, the verifySession() function is used to check the user's role and render the appropriate component based on the role.

For more information on Server Components in Next.js, you can check out the official documentation (https://nextjs.org/docs/app/building-your-application/rendering/server-components).