From 92dc32bf124ed7378c91e88ef96f3927b64650ba Mon Sep 17 00:00:00 2001
From: seb <sebgreenbus@gmail.com>
Date: Sun, 19 Jul 2026 19:43:23 +0200
Subject: [PATCH] cat

---
 docs/api/routes/article/search.md      |  7 +++---
 src/services/article/searchArticles.js | 30 +++++++++++++++++---------
 2 files changed, 24 insertions(+), 13 deletions(-)

diff --git a/docs/api/routes/article/search.md b/docs/api/routes/article/search.md
index 5441f5c..6cc1b79 100644
--- a/docs/api/routes/article/search.md
+++ b/docs/api/routes/article/search.md
@@ -32,7 +32,7 @@ Fuzzy article search. Use this to build a search box / result list with category
 
 Pass category IDs as a comma-separated list: `filter=16,39`.
 
-Whenever `filter` is present, **`categories` always includes every id from `filter`**, even when `length` is `0` or a filtered id has no hits. Those entries use master-data `name` / `parent` and may have `count: 0`. Other facet categories with hits are still returned as usual.
+Whenever `filter` is present, **`categories` always includes every id from `filter` and its full ancestor chain** (parent → … → root), even when `length` is `0` or a filtered id has no hits. Those entries use master-data `name` / `parent` and may have `count: 0`. Other facet categories with hits are still returned as usual.
 
 ## Response `200`
 
@@ -58,14 +58,15 @@ Whenever `filter` is present, **`categories` always includes every id from `filt
 }
 ```
 
-Empty result with an active filter still returns the applied category:
+Empty result with a nested filter still returns the leaf and its ancestors:
 
 ```json
 {
   "length": 0,
   "recordset": [],
   "categories": {
-    "16": { "name": "Dünger", "count": 0, "parent": 0 }
+    "16": { "name": "Dünger", "count": 0, "parent": 0 },
+    "39": { "name": "Erde", "count": 0, "parent": 16 }
   }
 }
 ```
diff --git a/src/services/article/searchArticles.js b/src/services/article/searchArticles.js
index 71352e8..7085371 100644
--- a/src/services/article/searchArticles.js
+++ b/src/services/article/searchArticles.js
@@ -77,18 +77,27 @@ function shapeCategories(counts, byId) {
     return categories;
 }
 
-/** Ensure every applied filter id appears in categories (count 0 if no hits). */
-function ensureFilterCategories(categories, filter, byId) {
+/**
+ * Ensure every applied filter id and its ancestors appear in categories
+ * (count 0 if no hits), so the frontend can render hierarchy via parent links.
+ */
+function ensureFilterCategories(categories, filter, byId, parentMap) {
     for (const id of filter) {
-        if (id === '' || id === null || categories[id]) {
+        if (id === '' || id === null) {
             continue;
         }
-        const meta = byId[id] ?? {};
-        categories[id] = {
-            count: 0,
-            name: meta.name ?? null,
-            parent: meta.parent ?? null,
-        };
+        for (const ancestorId of getUpPath(id, parentMap)) {
+            const key = String(ancestorId);
+            if (categories[key]) {
+                continue;
+            }
+            const meta = byId[ancestorId] ?? byId[key] ?? {};
+            categories[key] = {
+                count: 0,
+                name: meta.name ?? null,
+                parent: meta.parent ?? null,
+            };
+        }
     }
     return categories;
 }
@@ -206,7 +215,8 @@ export async function searchArticles(target, filter = [''], offset = 0, maxCount
             categoryData.byId
         ),
         filter,
-        categoryData.byId
+        categoryData.byId,
+        categoryData.parentMap
     );
     const length = result.recordset.length;
     const recordset = result.recordset