AI: address review on PR #460

backend/app/controllers/tag_versions_controller.rb

@@ -69,11 +69,8 @@ class TagVersionsController < ApplicationController
 
       parent_tags =
           build_version_values(cur_parent_tag_ids, prev_parent_tag_ids, key: :tag_id)
-          .filter_map do |h|
+          .map do |h|
-            parent = parent_json[h[:tag_id]]
+            { tag: parent_json.fetch(h[:tag_id]),
-            next unless parent
-
-            { tag: parent,
               type: h[:type] }
           end
 

backend/spec/requests/tag_versions_spec.rb

@@ -215,36 +215,6 @@ RSpec.describe 'TagVersions API', type: :request do
       expect(first.fetch('created_at')).to eq(t_v1.iso8601)
     end
 
-    [:parent_shared, :parent_new, :parent_old].each do |parent_key|
-      it "omits deleted #{ parent_key } from parent diffs" do
-        deleted_parent = public_send(parent_key)
-        deleted_parent.tag_names.destroy_all
-        deleted_parent.destroy!
-
-        get '/tags/versions', params: { id: tag.id }
-
-        expect(response).to have_http_status(:ok)
-        expect(json.fetch('count')).to eq(2)
-
-        versions = json.fetch('versions')
-        expect(versions.map { _1.fetch('version_no') }).to eq([2, 1])
-
-        expected_parents = [
-            [parent_shared.id, 'context'],
-            [parent_new.id, 'added'],
-            [parent_old.id, 'removed']].reject { _1.first == deleted_parent.id }
-        expect(versions.first.fetch('parent_tags').map { |entry|
-          [entry.fetch('tag').fetch('id'), entry.fetch('type')]
-        }).to eq(expected_parents)
-
-        expected_first_parents = [parent_shared.id, parent_old.id]
-            .reject { _1 == deleted_parent.id }.map { [_1, 'added'] }
-        expect(versions.second.fetch('parent_tags').map { |entry|
-          [entry.fetch('tag').fetch('id'), entry.fetch('type')]
-        }).to eq(expected_first_parents)
-      end
-    end
-
     it 'returns empty when the specified tag has no versions' do
       fresh_tag = create(:tag, primary_name: 'no_versions_tag', category: :general)
 

frontend/server.ssr.test.mjs

@@ -2,6 +2,7 @@ import assert from 'node:assert/strict'
 import { createServer } from 'node:http'
 import { spawn } from 'node:child_process'
 import { after, before, test } from 'node:test'
+import { JSDOM } from 'jsdom'
 import { createServer as createViteServer } from 'vite'
 
 import { render } from './dist/server/entry-server.js'
@@ -402,6 +403,26 @@ test ('every canonical screen route returns page HTML without JavaScript', async
   }
 })
 
+test ('SSR HTML head includes reciprocal hreflang links with query parameters', async () => {
+  for (const locale of ['ja', 'ain-Kana']) {
+    const response = await fetch (`${httpOrigin}/${locale}/posts?page=2&limit=50`)
+    assert.equal (response.status, 200)
+    const dom = new JSDOM (await response.text ())
+    try
+    {
+      const links = [...dom.window.document.head.querySelectorAll ('link[rel="alternate"]')]
+      assert.deepEqual (links.map (link => ({
+        locale: link.getAttribute ('hreflang'), href: link.getAttribute ('href') })), [
+        { locale: 'ja', href: `${origin}/ja/posts?page=2&limit=50` },
+        { locale: 'ain-Kana', href: `${origin}/ain-Kana/posts?page=2&limit=50` }])
+    }
+    finally
+    {
+      dom.window.close ()
+    }
+  }
+})
+
 test ('YouTube posts return HTTP 200 with the embed rendered by SSR', async t => {
   for (const locale of ['ja', 'ain-Kana']) {
     await t.test (locale, async () => {

frontend/src/entry-server.tsx

@@ -1,6 +1,6 @@
 import { QueryClient, QueryClientProvider, dehydrate, skipToken } from '@tanstack/react-query'
 import { PassThrough } from 'node:stream'
-import { renderToPipeableStream } from 'react-dom/server'
+import { renderToPipeableStream, renderToStaticMarkup } from 'react-dom/server'
 import { HelmetProvider } from 'react-helmet-async'
 import { I18nextProvider } from 'react-i18next'
 import { createStaticHandler, createStaticRouter,
@@ -9,7 +9,7 @@ import { createStaticHandler, createStaticRouter,
 import { AppFrame, appRoutes, resolvePageRoute } from '@/App'
 import { apiGet, isApiError } from '@/lib/api'
 import { createUII18n } from '@/lib/i18n'
-import { fetchLocales, isLocaleCode, legacyLocalePath } from '@/lib/locales'
+import { fetchLocales, isLocaleCode, legacyLocalePath, switchLocalePath } from '@/lib/locales'
 import { localesKeys, sessionKeys } from '@/lib/queryKeys'
 import { withRenderContext } from '@/lib/renderContext.server'
 
@@ -171,8 +171,26 @@ export const render = async (
 	}))
       }
       const helmet = helmetContext.helmet!
+      const alternates = status === 200 && known != null
+	  ? await Promise.all (locales.locales.map (entry => entry.code)
+	      .filter (isLocaleCode)
+	      .filter (code => known.route.handle?.locale == null
+		  || known.route.handle.locale === code)
+	      .map (async targetLocale => {
+		const location = { pathname: url.pathname, search: url.search, hash: '' }
+		const path = targetLocale === locale
+		    ? url.pathname + url.search
+		    : (known.route.handle?.switchLocale != null
+		       ? await known.route.handle.switchLocale ({
+			   location, params: known.params, locale, targetLocale })
+		       : switchLocalePath (location, targetLocale))
+		return <link key={targetLocale} rel="alternate" hrefLang={targetLocale}
+		    href={new URL (path, origin).href}/>
+	      }))
+	  : []
       const head = [helmet.title, helmet.meta, helmet.link, helmet.style]
 	  .map (entry => entry.toString ()).join ('')
+	  + renderToStaticMarkup (<>{alternates}</>)
       const dehydrated = dehydrate (client, { shouldDehydrateQuery: query =>
 	  query.state.status !== 'pending'
 	  && query.meta?.clientOnly !== true