エラー処理

export async function deleteInvoice(id: string) {
  throw new Error('Failed to Delete Invoice');
 
  // Unreachable code block
  try {
    await sql`DELETE FROM invoices WHERE id = ${id}`;
    revalidatePath('/dashboard/invoices');
    return { message: 'Deleted Invoice' };
  } catch (error) {
    return { message: 'Database Error: Failed to Delete Invoice' };
  }
}

'use client';
 
import { useEffect } from 'react';
 
export default function Error({
  error,
  reset,
}: {
  error: Error & { digest?: string };
  reset: () => void;
}) {
  useEffect(() => {
    // Optionally log the error to an error reporting service
    console.error(error);
  }, [error]);
 
  return (
    <main className="flex h-full flex-col items-center justify-center">
      <h2 className="text-center">Something went wrong!</h2>
      <button
        className="mt-4 rounded-md bg-blue-500 px-4 py-2 text-sm text-white transition-colors hover:bg-blue-400"
        onClick={
          // Attempt to recover by trying to re-render the invoices route
          () => reset()
        }
      >
        Try again
      </button>
    </main>
  );
}

export async function fetchInvoiceById(id: string) {
  noStore();
  try {
    // ...
 
    console.log(invoice); // Invoice is an empty array []
    return invoice[0];
  } catch (error) {
    console.error('Database Error:', error);
    throw new Error('Failed to fetch invoice.');
  }
}

import { fetchInvoiceById, fetchCustomers } from '@/app/lib/data';
import { updateInvoice } from '@/app/lib/actions';
import { notFound } from 'next/navigation';
 
export default async function Page(props: { params: Promise<{ id: string }> }) {
  const params = await props.params;
  const id = params.id;
  const [invoice, customers] = await Promise.all([
    fetchInvoiceById(id),
    fetchCustomers(),
  ]);
 
  if (!invoice) {
    notFound();
  }
 
  // ...
}

import Link from 'next/link';
import { FaceFrownIcon } from '@heroicons/react/24/outline';
 
export default function NotFound() {
  return (
    <main className="flex h-full flex-col items-center justify-center gap-2">
      <FaceFrownIcon className="w-10 text-gray-400" />
      <h2 className="text-xl font-semibold">404 Not Found</h2>
      <p>Could not find the requested invoice.</p>
      <Link
        href="/dashboard/invoices"
        className="mt-4 rounded-md bg-blue-500 px-4 py-2 text-sm text-white transition-colors hover:bg-blue-400"
      >
        Go Back
      </Link>
    </main>
  );
}