feat(db): Add support for stickies in database

Adds a 'sticky' column to threads and rewrites the thread index to
take sticky markings into account when ordering threads.

Stickies are not yet highlighted in any way in the forum overview.

1 files changed, 21 insertions, 0 deletions

diff --git a/migrations/2018-04-14-153202_add_stickies_improve_index/up.sql b/migrations/2018-04-14-153202_add_stickies_improve_index/up.sql
new file mode 100644
index 000000000000..74a559e35d00
--- /dev/null
+++ b/migrations/2018-04-14-153202_add_stickies_improve_index/up.sql
@@ -0,0 +1,21 @@
+-- Add support for stickies in threads
+ALTER TABLE threads ADD COLUMN sticky BOOLEAN NOT NULL DEFAULT FALSE;
+
+-- CREATE a simple view that returns the list of threads ordered by
+-- the last post that occured in the thread.
+CREATE VIEW thread_index AS
+  SELECT t.id AS thread_id,
+         t.title AS title,
+         t.author_name AS thread_author,
+         t.posted AS created,
+         t.sticky AS sticky,
+         p.id AS post_id,
+         p.author_name AS post_author,
+         p.posted AS posted
+    FROM threads t
+    JOIN (SELECT DISTINCT ON (thread_id)
+           id, thread_id, author_name, posted
+          FROM posts
+          ORDER BY thread_id, id DESC) AS p
+    ON t.id = p.thread_id
+    ORDER BY t.sticky DESC, p.id DESC;