knowledgebase: include the topic (application name) in list search

The KB list search matched only shortdescription + keywords, so searching a
topic (e.g. "Spotfire", the Application name) surfaced just the one article
whose title/keywords contained the word, not the others tied to it by topic.
Match the topic too via an appid IN (apps named like the term) subquery - used
instead of a join so it does not collide with the sort=topic join, and articles
with no app still match on title/keywords.

plugins/knowledgebase/api/routes.py

@@ -29,12 +29,19 @@ def list_articles():
 
     query = KnowledgeBase.query.filter_by(isactive=True)
 
-    # Search
+    # Search: title, keywords, and the topic (its Application's name). The topic
+    # is matched via an appid subquery instead of a join so it does not collide
+    # with the sort=='topic' join below; articles with no app just miss that
+    # clause and still match on title/keywords.
     if search := request.args.get('search'):
+        like = f'%{search}%'
+        topic_appids = db.session.query(Application.appid).filter(
+            Application.appname.ilike(like))
         query = query.filter(
             db.or_(
-                KnowledgeBase.shortdescription.ilike(f'%{search}%'),
-                KnowledgeBase.keywords.ilike(f'%{search}%')
+                KnowledgeBase.shortdescription.ilike(like),
+                KnowledgeBase.keywords.ilike(like),
+                KnowledgeBase.appid.in_(topic_appids)
             )
         )
 

tests/test_core/test_knowledgebase.py

@@ -32,3 +32,36 @@ def test_create_requires_shortdescription(client, db, auth_headers):
                        json={'linkurl': 'https://kb.example/x'},
                        headers=auth_headers)
     assert resp.status_code == 400
+
+
+def test_search_matches_topic_appname(client, db, auth_headers):
+    """Searching a topic (Application name) returns every article under it, not
+    just the one whose title/keywords happen to contain the word.
+
+    Regression: KB list search omitted the topic, so a topic-only match (e.g.
+    'Spotfire' as the app) surfaced a single article instead of all of them.
+    """
+    from shopdb.core.models import Application
+
+    app_row = Application(appname='Spotfire')
+    db.session.add(app_row)
+    db.session.flush()
+
+    # Two articles whose title/keywords do NOT contain 'Spotfire' - only the
+    # topic (appid) ties them to it - plus one that does mention it directly.
+    for payload in [
+        {'shortdescription': 'Dashboard login steps', 'keywords': 'login',
+         'linkurl': 'https://kb.example/a', 'appid': app_row.appid},
+        {'shortdescription': 'Export a visualization', 'keywords': 'export',
+         'linkurl': 'https://kb.example/b', 'appid': app_row.appid},
+        {'shortdescription': 'Spotfire install guide', 'keywords': 'install',
+         'linkurl': 'https://kb.example/c', 'appid': app_row.appid},
+    ]:
+        resp = client.post('/api/knowledgebase', json=payload, headers=auth_headers)
+        assert resp.status_code == 201, resp.get_json()
+
+    listing = client.get('/api/knowledgebase?search=Spotfire', headers=auth_headers)
+    assert listing.status_code == 200
+    urls = {a['linkurl'] for a in listing.get_json()['data']}
+    assert {'https://kb.example/a', 'https://kb.example/b',
+            'https://kb.example/c'} <= urls