FIX: Skip whisper posts when updating topic like count (#10157)

db/migrate/20200707154522_fix_topic_like_count.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+class FixTopicLikeCount < ActiveRecord::Migration[6.0]
+  def up
+    return if DB.query_single("SELECT * FROM site_settings WHERE name = 'enable_whispers' AND value = 't'").empty?
+
+    DB.exec(<<~SQL, whisper: Post.types[:whisper])
+      UPDATE topics SET like_count = tbl.like_count
+      FROM (
+        SELECT topic_id, SUM(like_count) like_count
+        FROM posts
+        WHERE deleted_at IS NULL AND post_type <> :whisper
+        GROUP BY topic_id
+      ) AS tbl
+      WHERE topics.id = tbl.topic_id
+        AND topics.like_count <> tbl.like_count
+    SQL
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+end