From 209973e72b0218022b5adcf5752a331c2b949f3f Mon Sep 17 00:00:00 2001
From: Daniel O'Connor <daniel.oconnor@gmail.com>
Date: Sun, 26 Apr 2026 09:26:52 +0000
Subject: [PATCH] Memory usage

---
 app/models/post.rb | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/app/models/post.rb b/app/models/post.rb
index 13c0295c3..8e031a0a6 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -49,9 +49,10 @@ class Post < ApplicationRecord
 
   # return posts sorted by recent activity
   def self.recently_active
-    Post.order(created_at: :desc).sort do |a, b|
-      b.recent_activity <=> a.recent_activity
-    end
+    left_joins(:comments)
+      .select('posts.*, COALESCE(MAX(comments.created_at), posts.created_at) AS last_activity_at')
+      .group('posts.id')
+      .order(Arel.sql('last_activity_at DESC'))
   end
 
   def owner_id