Fix lcase function

cps/db.py

@@ -546,14 +546,14 @@ class CalibreDB(threading.Thread):
 
     def get_typeahead(self, database, query, replace=('', ''), tag_filter=true()):
         query = query or ''
-        self.session.connection().connection.connection.create_function("lower", 1, self.lcase)
+        self.session.connection().connection.connection.create_function("lower", 1, lcase)
         entries = self.session.query(database).filter(tag_filter). \
             filter(func.lower(database.name).ilike("%" + query + "%")).all()
         json_dumps = json.dumps([dict(name=r.name.replace(*replace)) for r in entries])
         return json_dumps
 
     def check_exists_book(self, authr, title):
-        self.session.connection().connection.connection.create_function("lower", 1, self.lcase)
+        self.session.connection().connection.connection.create_function("lower", 1, lcase)
         q = list()
         authorterms = re.split(r'\s*&\s*', authr)
         for authorterm in authorterms:
@@ -565,7 +565,7 @@ class CalibreDB(threading.Thread):
     # read search results from calibre-database and return it (function is used for feed and simple search
     def get_search_results(self, term):
         term.strip().lower()
-        self.session.connection().connection.connection.create_function("lower", 1, self.lcase)
+        self.session.connection().connection.connection.create_function("lower", 1, lcase)
         q = list()
         authorterms = re.split("[, ]+", term)
         for authorterm in authorterms:
@@ -642,8 +642,10 @@ class CalibreDB(threading.Thread):
         self.engine.dispose()
         self.setup_db(config, app_db_path)
 
-    def lcase(self, s):
-        try:
-            return unidecode.unidecode(s.lower())
-        except Exception as e:
-            self.log.exception(e)
+def lcase(s):
+    try:
+        return unidecode.unidecode(s.lower())
+    except Exception as e:
+        log = logger.create()
+        log.exception(e)
+        return s.lower()

cps/web.py

@@ -590,7 +590,7 @@ def get_languages_json():
 def get_matching_tags():
     tag_dict = {'tags': []}
     q = calibre_db.session.query(db.Books)
-    calibre_db.session.connection().connection.connection.create_function("lower", 1, calibre_db.lcase)
+    calibre_db.session.connection().connection.connection.create_function("lower", 1, db.lcase)
     author_input = request.args.get('author_name') or ''
     title_input = request.args.get('book_title') or ''
     include_tag_inputs = request.args.getlist('include_tag') or ''
@@ -1020,7 +1020,7 @@ def search():
 def advanced_search():
     # Build custom columns names
     cc = get_cc_columns()
-    calibre_db.session.connection().connection.connection.create_function("lower", 1, calibre_db.lcase)
+    calibre_db.session.connection().connection.connection.create_function("lower", 1, db.lcase)
     q = calibre_db.session.query(db.Books).filter(calibre_db.common_filters()).order_by(db.Books.sort)
 
     include_tag_inputs = request.args.getlist('include_tag')