From 6246dd0aa22bb0053cc0fb1876713e8d08db829d Mon Sep 17 00:00:00 2001
From: Sam <sam.saffron@gmail.com>
Date: Fri, 2 Oct 2015 12:35:47 +1000
Subject: [PATCH] PERF: memoize to avoid N+1 query in category page

---
 app/models/category.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/app/models/category.rb b/app/models/category.rb
index c7740a799..bd5e85914 100644
--- a/app/models/category.rb
+++ b/app/models/category.rb
@@ -382,7 +382,8 @@ SQL
   end
 
   def has_children?
-    id && Category.where(parent_category_id: id).exists?
+    @has_children ||= (id && Category.where(parent_category_id: id).exists?) ? :true : :false
+    @has_children == :true
   end
 
   def uncategorized?