From 1f802968c5a803f649fc27c7295b01aef3af6514 Mon Sep 17 00:00:00 2001
From: Jeremy Kemper <jeremy@bitsweat.net>
Date: Wed, 30 May 2007 06:57:04 +0000
Subject: Calculations: return nil average instead of 0 when there are no rows
 to average. Closes #8298.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@6904 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
---
 activerecord/lib/active_record/calculations.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'activerecord/lib')

diff --git a/activerecord/lib/active_record/calculations.rb b/activerecord/lib/active_record/calculations.rb
index a54ef468e0..09c0c979e6 100644
--- a/activerecord/lib/active_record/calculations.rb
+++ b/activerecord/lib/active_record/calculations.rb
@@ -265,7 +265,7 @@ module ActiveRecord
           operation = operation.to_s.downcase
           case operation
             when 'count' then value.to_i
-            when 'avg'   then value.to_f
+            when 'avg'   then value && value.to_f
             else column ? column.type_cast(value) : value
           end
         end
-- 
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