From fe0dc8161a05b3168646d2958d4732e9a7d61c90 Mon Sep 17 00:00:00 2001
From: Erik Ordway <eriko@jumpsuit.org>
Date: Mon, 21 Oct 2013 09:28:35 -0700
Subject: [PATCH] Update 20131017014509_add_post_count_to_categories.rb

In case the category does not have any posts yet. You get a null value error running the migration if this is the case.
---
 db/migrate/20131017014509_add_post_count_to_categories.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/db/migrate/20131017014509_add_post_count_to_categories.rb b/db/migrate/20131017014509_add_post_count_to_categories.rb
index 34773c24a..809eb65e8 100644
--- a/db/migrate/20131017014509_add_post_count_to_categories.rb
+++ b/db/migrate/20131017014509_add_post_count_to_categories.rb
@@ -3,7 +3,7 @@ class AddPostCountToCategories < ActiveRecord::Migration
     add_column :categories, :post_count, :integer, null: false, default: 0
     execute <<SQL
     UPDATE categories
-    SET post_count = (SELECT SUM(posts_count) FROM topics
+    SET post_count = (SELECT COALESCE(SUM(posts_count),0) FROM topics
                       WHERE category_id = categories.id AND deleted_at IS NULL)
 SQL
   end