From 976beade8514a435408b17251766be14741ca47b Mon Sep 17 00:00:00 2001
From: Keith Edmunds <kae@tiger-computing.co.uk>
Date: Tue, 10 Aug 2021 18:28:20 +0100
Subject: [PATCH] Add debug to troubleshoot issue #38

---
 app/model.py | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/app/model.py b/app/model.py
index 5c43c6d..718a138 100644
--- a/app/model.py
+++ b/app/model.py
@@ -317,10 +317,17 @@ class PlaylistTracks(Base):
         else:
             # Destination playlist has tracks; add to end
             new_row = max_row + 1
-        record = session.query(PlaylistTracks).filter(
-            PlaylistTracks.playlist_id == from_playlist_id,
-            PlaylistTracks.row == row
-        ).one()
+        try:
+            record = session.query(PlaylistTracks).filter(
+                PlaylistTracks.playlist_id == from_playlist_id,
+                PlaylistTracks.row == row).one()
+        except NoResultFound:
+            # Issue #38?
+            ERROR(
+                f"No rows matched in query: "
+                f"PlaylistTracks.playlist_id == {from_playlist_id}, "
+                f"PlaylistTracks.row == {row}"
+            )
         record.playlist_id = to_playlist_id
         record.row = new_row
         session.commit()