VN: Add support for multiple titles in different languages

This implements the main database model part of custom title languages
(https://vndb.org/t12465). Selecting the right title for display is done
in SQL through the 'vnt' VIEW, which can be overridden in each session
with a TEMPORARY VIEW in order to support user title preferences, but
that part has not been implemented yet.

I had started out using an sql_vn() function that returned a subquery
instead of using a VIEW, but then ran into trouble with the item_info()
SQL function. This VIEW approach also happened to simplify much of the
code. I did have to get rid of the Discusssions::Lib::sql_boards()
function, as Postgres was unable to optimize the subquery inside a UNION
inside a subquery for some reason. Haven't run into any other noticeable
performance regressions yet.

TODO:
- Implement actual user title preferences
- Add the correct 'lang' HTML attributes everywhere a title is displayed
  (we do have the information now, though it still isn't trivial)
- Add title fetching support to API

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/VNWeb/TT/TagPage.pm b/lib/VNWeb/TT/TagPage.pm
index 0a5fa903..7863ac12 100644
--- a/lib/VNWeb/TT/TagPage.pm
+++ b/lib/VNWeb/TT/TagPage.pm
@@ -102,9 +102,9 @@ sub vns_ {
     db_maytimeout {
         $count = tuwf->dbVali('SELECT count(*) FROM vn v JOIN tags_vn_inherit tvi ON tvi.vid = v.id WHERE', $where);
         $list = $count ? tuwf->dbPagei({results => $opt->{s}->results(), page => $opt->{p}}, '
-            SELECT tvi.rating AS tagscore, v.id, v.title, v.original, v.c_released, v.c_popularity, v.c_votecount, v.c_rating, v.c_average
+            SELECT tvi.rating AS tagscore, v.id, v.title, v.alttitle, v.c_released, v.c_popularity, v.c_votecount, v.c_rating, v.c_average
                  , v.image, v.c_platforms::text[] AS platforms, v.c_languages::text[] AS lang
-              FROM vn v
+              FROM vnt v
               JOIN tags_vn_inherit tvi ON tvi.vid = v.id
              WHERE', $where, '
              ORDER BY', $opt->{s}->sql_order(),