Additional Rails 4.1 optimizations

app/logical/post_sets/popular.rb

@@ -8,7 +8,11 @@ module PostSets
     end
 
     def posts
-      ::Post.where("created_at between ? and ?", min_date.beginning_of_day, max_date.end_of_day).order("score desc").limit(limit)
+      @posts ||= begin
+        query = ::Post.where("created_at between ? and ?", min_date.beginning_of_day, max_date.end_of_day).order("score desc").limit(limit)
+        query.each # hack to force rails to eager load
+        query
+      end
     end
 
     def limit