feat(i18n): add localized navigation and news translations

packages/db/src/posts.test.ts

@@ -9,6 +9,9 @@ const { mockDb } = vi.hoisted(() => ({
       update: vi.fn(),
       delete: vi.fn(),
     },
+    postTranslation: {
+      upsert: vi.fn(),
+    },
   },
 }))
 
@@ -16,7 +19,15 @@ vi.mock("./client", () => ({
   db: mockDb,
 }))
 
-import { createPost, getPostBySlug, listPosts, updatePost } from "./posts"
+import {
+  createPost,
+  getPostBySlug,
+  getPostBySlugForLocale,
+  listPosts,
+  listPostsForLocale,
+  updatePost,
+  upsertPostTranslation,
+} from "./posts"
 
 describe("posts service", () => {
   beforeEach(() => {
@@ -25,6 +36,7 @@ describe("posts service", () => {
         fn.mockReset()
       }
     }
+    mockDb.postTranslation.upsert.mockReset()
   })
 
   it("lists posts ordered by update date desc", async () => {
@@ -72,4 +84,63 @@ describe("posts service", () => {
       },
     })
   })
+
+  it("upserts post translation and reads localized/fallback post views", async () => {
+    mockDb.postTranslation.upsert.mockResolvedValue({ id: "pt-1" })
+    mockDb.post.findUnique
+      .mockResolvedValueOnce({
+        id: "post-1",
+        slug: "hello",
+        title: "Base title",
+        excerpt: "Base excerpt",
+        body: "Base body",
+        translations: [{ locale: "de", title: "Titel", excerpt: "Auszug", body: "Text" }],
+      })
+      .mockResolvedValueOnce({
+        id: "post-1",
+        slug: "hello",
+        title: "Base title",
+        excerpt: "Base excerpt",
+        body: "Base body",
+        translations: [],
+      })
+    mockDb.post.findMany.mockResolvedValue([
+      {
+        id: "post-1",
+        slug: "hello",
+        title: "Base title",
+        excerpt: "Base excerpt",
+        body: "Base body",
+        status: "published",
+        translations: [{ locale: "de", title: "Titel", excerpt: "Auszug", body: "Text" }],
+      },
+    ])
+
+    await upsertPostTranslation({
+      postId: "550e8400-e29b-41d4-a716-446655440000",
+      locale: "de",
+      title: "Titel",
+      body: "Text",
+    })
+
+    const localized = await getPostBySlugForLocale("hello", "de")
+    const fallback = await getPostBySlugForLocale("hello", "fr")
+    const localizedList = await listPostsForLocale("de")
+
+    expect(mockDb.postTranslation.upsert).toHaveBeenCalledTimes(1)
+    expect(localized?.title).toBe("Titel")
+    expect(fallback?.title).toBe("Base title")
+    expect(localizedList[0]?.title).toBe("Titel")
+  })
+
+  it("validates locale for post translations", async () => {
+    await expect(() =>
+      upsertPostTranslation({
+        postId: "550e8400-e29b-41d4-a716-446655440000",
+        locale: "it",
+        title: "Titolo",
+        body: "Testo",
+      }),
+    ).rejects.toThrow()
+  })
 })