fix printer batch vendor resolution + base url

tests/test_plugins/test_printer_install_batch.py

@@ -72,6 +72,33 @@ def test_install_batch_groups_universal_specific_and_manual(
     assert 'c350navi.zip' not in bat  # never handed to the runner
 
 
+def test_install_batch_resolves_vendor_via_model(
+        client, db, auth_headers, printer_assettype):
+    """A printer with no direct vendorid still groups as universal when its
+    MODEL's vendor is HP/Xerox (the import sets the model, not the printer's
+    vendorid) - the bug that dumped every prod printer into 'manual (unknown)'."""
+    from shopdb.core.models import Vendor, Model
+
+    xerox = Vendor(vendor='Xerox')
+    db.session.add(xerox)
+    db.session.commit()
+    model = Model(modelnumber='VersaLink C7125', vendorid=xerox.vendorid)
+    db.session.add(model)
+    db.session.commit()
+
+    # No vendorid on the printer - only the model ties it to Xerox.
+    pid = _make_printer(client, auth_headers, assetnumber='SpoolsInspection-Xerox',
+                        hostname='wjprn07', modelnumberid=model.modelnumberid)
+
+    resp = client.get('/api/printers/install-batch?printerids=%d' % pid,
+                      headers=auth_headers)
+    assert resp.status_code == 200
+    bat = resp.get_data(as_text=True)
+    assert 'PrinterInstaller.exe' in bat
+    assert '/PRINTER="SpoolsInspection-Xerox"' in bat
+    assert 'MANUAL' not in bat
+
+
 def test_install_batch_requires_ids(client, db, auth_headers, printer_assettype):
     resp = client.get('/api/printers/install-batch', headers=auth_headers)
     assert resp.status_code == 400