From 8467be9e142b0eb75b9007ca9510592ab11368b5 Mon Sep 17 00:00:00 2001
From: Ryan Wallace <rywall@gmail.com>
Date: Fri, 30 Aug 2013 16:16:38 -0700
Subject: [PATCH] Don't use Enumerable#next in pluck since it is very slow

---
 activerecord/lib/active_record/relation/calculations.rb | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/activerecord/lib/active_record/relation/calculations.rb b/activerecord/lib/active_record/relation/calculations.rb
index 52a538e5b5d55..27c04b0952a5f 100644
--- a/activerecord/lib/active_record/relation/calculations.rb
+++ b/activerecord/lib/active_record/relation/calculations.rb
@@ -161,8 +161,7 @@ def pluck(*column_names)
         result = result.map do |attributes|
           values = klass.initialize_attributes(attributes).values
 
-          iter = columns.each
-          values.map { |value| iter.next.type_cast value }
+          columns.zip(values).map { |column, value| column.type_cast value }
         end
         columns.one? ? result.map!(&:first) : result
       end