PERF: reverse index on topic users to speed up join

2026-07-29 23:58:12 -05:00 · 2014-09-10 23:03:59 +10:00
parent ca2100d012
commit af75360942
1 changed files with 6 additions and 0 deletions
@@ -0,0 +1,6 @@
+class CreateTopicUserIndex < ActiveRecord::Migration
+  def change
+    # seems to be the most effective for joining into topics
+    add_index :topic_users, [:user_id, :topic_id], unique: true
+  end
+end