From 7dc52a9655477e96c789be8005e9c834e161e4c4 Mon Sep 17 00:00:00 2001
From: swaggboi <swaggboi@slackware.uk>
Date: Fri, 27 Oct 2023 14:34:17 -0400
Subject: [PATCH] Create migrations for FTS

---
 migrations/15/down.sql |  7 +++++++
 migrations/15/up.sql   | 27 +++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 migrations/15/down.sql
 create mode 100644 migrations/15/up.sql

diff --git a/migrations/15/down.sql b/migrations/15/down.sql
new file mode 100644
index 0000000..404e499
--- /dev/null
+++ b/migrations/15/down.sql
@@ -0,0 +1,7 @@
+DROP EXTENSION pg_trgm;
+
+ALTER TABLE threads
+ DROP COLUMN search_tokens;
+
+ALTER TABLE remarks
+ DROP COLUMN search_tokens;
diff --git a/migrations/15/up.sql b/migrations/15/up.sql
new file mode 100644
index 0000000..6f8e0ca
--- /dev/null
+++ b/migrations/15/up.sql
@@ -0,0 +1,27 @@
+-- Fuzzy search
+-- https://hevodata.com/blog/postgresql-full-text-search-setup/#Fuzzy_Search_vs_Full_Text_Search
+CREATE EXTENSION pg_trgm;
+
+-- Create column for seearch tokens
+    ALTER TABLE threads
+      ADD COLUMN search_tokens tsvector
+GENERATED ALWAYS AS
+          (to_tsvector('english', thread_author) ||
+           to_tsvector('english', thread_title ) ||
+           to_tsvector('english', thread_body  )) STORED;
+
+-- Create GIN index for search tokens
+CREATE INDEX threads_search_idx
+    ON threads
+ USING GIN(search_tokens);
+
+-- Same for remarks
+    ALTER TABLE remarks
+      ADD COLUMN search_tokens tsvector
+GENERATED ALWAYS AS
+          (to_tsvector('english', remark_author) ||
+           to_tsvector('english', remark_body  )) STORED;
+
+CREATE INDEX remarks_search_idx
+    ON remarks
+ USING GIN(search_tokens);