From 1b036c92ff9791a63b6ba51a97f4f223f7456f4d Mon Sep 17 00:00:00 2001
From: Igor Alexandrov <igor.alexandrov@gmail.com>
Date: Sun, 13 Feb 2011 17:59:12 +0300
Subject: [PATCH] Allow array as order param for postgresql

---
 activerecord/lib/active_record/base.rb             |    6 +++++-
 .../connection_adapters/postgresql_adapter.rb      |   19 ++++++++++++++-----
 2 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index ac82cc1..376ea1e 100755
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -1769,7 +1769,11 @@ module ActiveRecord #:nodoc:
           scope = scope(:find) if :auto == scope
           scoped_order = scope[:order] if scope
           if order
-            sql << " ORDER BY #{order}"
+            if order.is_a?(Array)
+              sql << " ORDER BY #{order.join(', ')}"  
+            else
+              sql << " ORDER BY #{order}"
+            end            
             if scoped_order && scoped_order != order
               sql << ", #{scoped_order}"
             end
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
index a348318..e3986d7 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
@@ -890,10 +890,14 @@ module ActiveRecord
 
         # Construct a clean list of column names from the ORDER BY clause, removing
         # any ASC/DESC modifiers
-        order_columns = order_by.split(',').collect { |s| s.split.first }
-        order_columns.delete_if &:blank?
-        order_columns = order_columns.zip((0...order_columns.size).to_a).map { |s,i| "#{s} AS alias_#{i}" }
-
+        if order_by.is_a?(Array)
+          order_columns = order_by.zip((0...order_by.size).to_a).map { |s,i| "#{s.gsub(/ASC|DESC/, '').strip} AS alias_#{i}" }
+        else
+          order_columns = order_by.split(',').collect { |s| s.split.first }
+          order_columns.delete_if &:blank?
+          order_columns = order_columns.zip((0...order_columns.size).to_a).map { |s,i| "#{s} AS alias_#{i}" }
+        end
+        
         # Return a DISTINCT ON() clause that's distinct on the columns we want but includes
         # all the required columns for the ORDER BY to work properly.
         sql = "DISTINCT ON (#{columns}) #{columns}, "
@@ -907,7 +911,12 @@ module ActiveRecord
       def add_order_by_for_association_limiting!(sql, options) #:nodoc:
         return sql if options[:order].blank?
 
-        order = options[:order].split(',').collect { |s| s.strip }.reject(&:blank?)
+        if options[:order].is_a?(Array)
+          order = options[:order].clone
+        else
+          order = options[:order].split(',').collect { |s| s.strip }.reject(&:blank?)          
+        end
+        
         order.map! { |s| 'DESC' if s =~ /\bdesc$/i }
         order = order.zip((0...order.size).to_a).map { |s,i| "id_list.alias_#{i} #{s}" }.join(', ')
 
-- 
1.7.3.2