fix(seo): correct canonical tags and localized blog post hreflang

app/[locale]/blog/[slug]/page.tsx

@@ -6,6 +6,7 @@ import {
   getAdjacentPosts,
   getReadingTime,
   extractLexicalHeadings,
+  getPostSlugs,
 } from '@/lib/blog';
 import { Metadata } from 'next';
 import Link from 'next/link';
@@ -33,12 +34,21 @@ export async function generateMetadata({ params }: BlogPostProps): Promise<Metad
 
   if (!post) return {};
 
+  const slugs = await getPostSlugs(slug, locale);
+  const deSlug = slugs?.de || post.slug;
+  const enSlug = slugs?.en || post.slug;
+
   const description = post.frontmatter.excerpt || '';
   return {
     title: post.frontmatter.title,
     description: description,
     alternates: {
       canonical: `${SITE_URL}/${locale}/blog/${post.slug}`,
+      languages: {
+        de: `${SITE_URL}/de/blog/${deSlug}`,
+        en: `${SITE_URL}/en/blog/${enSlug}`,
+        'x-default': `${SITE_URL}/en/blog/${enSlug}`,
+      },
     },
     openGraph: {
       title: `${post.frontmatter.title} | KLZ Cables`,

app/[locale]/layout.tsx

@@ -35,13 +35,6 @@ export async function generateMetadata(props: {
     },
     metadataBase: new URL(baseUrl),
     manifest: '/manifest.webmanifest',
-    alternates: {
-      canonical: `${baseUrl}/${locale}`,
-      languages: {
-        de: `${baseUrl}/de`,
-        en: `${baseUrl}/en`,
-      },
-    },
     icons: {
       icon: [
         { url: '/favicon.ico', sizes: 'any' },

lib/blog.ts

@@ -136,6 +136,60 @@ export async function getPostBySlug(slug: string, locale: string): Promise<PostD
   }
 }
 
+export async function getPostSlugs(slug: string, locale: string): Promise<Record<string, string>> {
+  try {
+    const payload = await getPayload({ config: configPromise });
+
+    // First, find the post in the current locale to get its ID
+    let { docs } = await payload.find({
+      collection: 'posts',
+      where: {
+        slug: { equals: slug },
+        ...(!config.showDrafts ? { _status: { equals: 'published' } } : {}),
+      },
+      locale: locale as any,
+      draft: config.showDrafts,
+      limit: 1,
+    });
+
+    if (!docs || docs.length === 0) {
+      // Fallback: search across all locales
+      const { docs: crossLocaleDocs } = await payload.find({
+        collection: 'posts',
+        where: {
+          slug: { equals: slug },
+          ...(!config.showDrafts ? { _status: { equals: 'published' } } : {}),
+        },
+        locale: 'all',
+        draft: config.showDrafts,
+        limit: 1,
+      });
+      docs = crossLocaleDocs;
+    }
+
+    if (!docs || docs.length === 0) return {};
+
+    const postId = docs[0].id;
+
+    // Fetch the post with locale 'all' to get all localized fields
+    const { docs: allLocalesDocs } = await payload.find({
+      collection: 'posts',
+      where: {
+        id: { equals: postId },
+      },
+      locale: 'all',
+      draft: config.showDrafts,
+      limit: 1,
+    });
+
+    if (!allLocalesDocs || allLocalesDocs.length === 0) return {};
+    return (allLocalesDocs[0].slug as unknown as Record<string, string>) || {};
+  } catch (error) {
+    console.error(`[Payload] getPostSlugs failed for ${slug}:`, error);
+    return {};
+  }
+}
+
 export async function getAllPosts(locale: string): Promise<PostData[]> {
   try {
     const payload = await getPayload({ config: configPromise });