Erste brauchbare Version

app/(app)/post/[slug]/page.tsx

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+import { notFound } from 'next/navigation';
+import Link from 'next/link';
+import { getPreview } from '@/lib/preview';
+import config from '@payload-config';
+import { getPayload } from 'payload';
+import { RichText } from '@payloadcms/richtext-lexical/react';
+
+type Props = Readonly<{
+	params: Promise<{
+		slug: string;
+	}>;
+}>;
+
+export default async function Page({ params }: Props) {
+	const { isPreview, where } = await getPreview();
+	const { slug } = await params;
+	const payload = await getPayload({ config });
+
+	const result = await payload.find({
+		collection: 'posts',
+		where: {
+			...where,
+			slug: {
+				equals: slug
+			}
+		},
+		draft: isPreview,
+		limit: 1
+	});
+
+	const post = result.docs[0];
+
+	if (!post)
+		return notFound();
+
+	return (
+		<div className="m-4">
+			<Link
+				className="border border-1 border-primary"
+				href="/"
+			>
+				Zurück
+			</Link>
+			<h1 className="font-bold">{post.title}</h1>
+			<RichText data={post.content} />
+		</div>
+	);
+}