From 5c9355fccc335eacb870c47498165324bd16f467 Mon Sep 17 00:00:00 2001
From: Nenad Vujicic <nenadus@gmail.com>
Date: Mon, 20 Jan 2025 12:58:51 +0100
Subject: [PATCH] Copies description, user_id and user_ip to notes

Adds migration script for copying description, user_id and user_ip from first note's comment to notes table.
---
 ...250212160355_backfill_note_descriptions.rb | 30 +++++++++++++++++++
 db/structure.sql                              |  1 +
 2 files changed, 31 insertions(+)
 create mode 100644 db/migrate/20250212160355_backfill_note_descriptions.rb

diff --git a/db/migrate/20250212160355_backfill_note_descriptions.rb b/db/migrate/20250212160355_backfill_note_descriptions.rb
new file mode 100644
index 0000000000..63568592e6
--- /dev/null
+++ b/db/migrate/20250212160355_backfill_note_descriptions.rb
@@ -0,0 +1,30 @@
+class BackfillNoteDescriptions < ActiveRecord::Migration[7.2]
+  class Note < ApplicationRecord; end
+  class NoteComment < ApplicationRecord; end
+
+  disable_ddl_transaction!
+
+  def up
+    Note.in_batches(:of => 1000) do |notes|
+      note_ids = notes.pluck(:id)
+
+      sql_query = <<-SQL.squish
+        WITH first_comment AS(
+          SELECT DISTINCT ON (note_id) *
+          FROM note_comments
+          WHERE note_id BETWEEN #{note_ids.min} AND #{note_ids.max}
+          ORDER BY note_id, id
+        )
+        UPDATE notes
+        SET description = first_comment.body,
+            user_id = first_comment.author_id,
+            user_ip = first_comment.author_ip
+        FROM first_comment
+        WHERE first_comment.note_id = notes.id
+          AND first_comment.event = 'opened';
+      SQL
+
+      ActiveRecord::Base.connection.execute(sql_query)
+    end
+  end
+end
diff --git a/db/structure.sql b/db/structure.sql
index d23c2d7487..1af934e029 100644
--- a/db/structure.sql
+++ b/db/structure.sql
@@ -3429,6 +3429,7 @@ INSERT INTO "schema_migrations" (version) VALUES
 ('23'),
 ('22'),
 ('21'),
+('20250212160355'),
 ('20250206202905'),
 ('20250121191749'),
 ('20250105154621'),