From 99bf8b9dacf7a64260d7d1cd9536df7a5c702811 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sat, 19 Sep 2020 06:49:20 +0530
Subject: [PATCH] Apparently write_serialized is needed

---
 src/calibre/db/legacy.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/calibre/db/legacy.py b/src/calibre/db/legacy.py
index baec62e603..92cd81d09a 100644
--- a/src/calibre/db/legacy.py
+++ b/src/calibre/db/legacy.py
@@ -141,6 +141,10 @@ class ThreadSafePrefs(MutableMapping):
             prefs = db.backend.prefs
             return prefs.set_namespaced(namespace, key, val)
 
+    def write_serialized(self, library_path):
+        prefs = self.db().backend.prefs
+        prefs.write_serialized(library_path)
+
 
 class LibraryDatabase(object):