Tag Browser: Fix clicking on first-letter groups for series not working

src/calibre/db/fields.py

@@ -670,6 +670,24 @@ class SeriesField(ManyToOneField):
         val = self.table.id_map[item_id]
         return title_sort(val, order=tss, lang=lang)
 
+    def iter_searchable_values_for_sort(self, candidates, lang_map, default_value=None):
+        cbm = self.table.col_book_map
+        sso = tweaks['title_series_sorting']
+        ts = title_sort
+        empty = set()
+        lang_map = {k:v[0] if v else None for k, v in lang_map.iteritems()}
+        for item_id, val in self.table.id_map.iteritems():
+            book_ids = cbm.get(item_id, empty).intersection(candidates)
+            if book_ids:
+                lang_counts = Counter()
+                for book_id in book_ids:
+                    lang = lang_map.get(book_id)
+                    if lang:
+                        lang_counts[lang[0]] += 1
+                lang = lang_counts.most_common(1)[0][0] if lang_counts else None
+                yield ts(val, order=sso, lang=lang), book_ids
+
+
 class TagsField(ManyToManyField):
 
     def get_news_category(self, tag_class, book_ids=None):

src/calibre/db/search.py

@@ -682,6 +682,13 @@ class Parser(SearchQueryParser):  # {{{
                         if _match(q, val, matchkind, use_primary_find_in_search=upf):
                             matches |= book_ids
 
+            if location == 'series_sort':
+                book_lang_map = self.dbcache.fields['languages'].book_value_map
+                for val, book_ids in self.dbcache.fields['series'].iter_searchable_values_for_sort(current_candidates, book_lang_map):
+                    if val is not None:
+                        if _match(q, (val,), matchkind, use_primary_find_in_search=upf):
+                            matches |= book_ids
+
         return matches
 
     def get_user_category_matches(self, location, query, candidates):

src/calibre/db/tests/reading.py

@@ -290,7 +290,7 @@ class ReadingTest(BaseTest):
             'title:="Title One"', 'title:~title', '#enum:=one', '#enum:tw',
             '#enum:false', '#enum:true', 'series:one', 'tags:one', 'tags:true',
             'tags:false', 'uuid:2', 'one', '20.02', '"publisher one"',
-            '"my comments one"',
+            '"my comments one"', 'series_sort:one',
 
             # User categories
             '@Good Authors:One', '@Good Series.good tags:two',