The retrieved information remains unchanged even after modifications are made on the subsequent Next.js server-side rendered page

I'm facing an interesting scenario with my application. It consists of two main pages - one displaying user account statistics and the other allowing users to edit these statistics. Both pages are rendered on the server side. When I navigate to the first page, I see the data fetched from the database. Upon moving to the second page, making changes, and returning back using the 'next/link' component, I notice that the initial statistics are displayed rather than updated ones. It appears that the page is caching the fetched data and not refreshing it upon return. What steps can be taken to ensure that the data is updated every time a user visits the statistics page? One potential solution could involve converting it into a client-side component and utilizing the useEffect(() => {}, []) hook. Your thoughts?

Below is the code snippet for the statistics page:

import Sidebar from "@/components/sidebar/component"
import Header from "@/components/header/component"
import StatisticsBoard from "@/components/statisticsBoard/component"
import { getServerSession } from "next-auth"
import { authOptions } from "@/app/api/auth/[...nextauth]/route"
import { redirect } from "next/navigation"

export default async function Home() {
    const session = await getServerSession(authOptions)
    if(!session) redirect("/")
    let loadedAllocations = (await (await fetch("http://localhost:3000/api/getAllocations", {

        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({  userId: session.user.id })

    })).json()).allocations

    // Rest of the code...

Answer №1

While I may not be well-versed in the App router, it appears that Next.js automatically caches your requests since you are utilizing server components. This can be beneficial for performance optimization. If needed, you can manually invalidate the cache, especially after updating certain data like statistics on a specific page. By utilizing the revalidatePath API as outlined in the documentation here, you can trigger the execution of queries again.

Exploring CodeSandbox for a Practical Demo:

In my exploration with the Next.js app router and cache invalidation, I have created a functional demo illustrating how to achieve your desired outcome. You can access the working example here.

A few key points to consider:

  1. Enabling experimental server actions in your next.config.js is essential for the example to function properly; do remember to restart the server afterwards.
  2. It's important to note that revalidating API routes within the /pages directory may not work as expected; consider using routes at /app/my-route/route.js instead.
  3. The behavior of revalidatePath might seem confusing initially, notably when specifying arguments. In my experience, only passing "/" effectively invalidated the server component cache, potentially affecting content within the entire /app directory.
  4. If encountering any difficulties locally, clearing the cache entirely by removing the .next folder could prove beneficial.

Although adjustments will be necessary to tailor the provided example to your specific requirements and APIs, demonstrating how the cached API response consistently displays until cache invalidation occurs shows the value of implementing such strategies for enhancing user experience.

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