From e4eb64bab3eaa40ce22f0d0c7d008c6eea2988ca Mon Sep 17 00:00:00 2001
From: Aaron Patterson <aaron.patterson@gmail.com>
Date: Sun, 25 Jul 2010 17:33:13 -0700
Subject: moving engine to the child class for future refactoring

---
 lib/arel/algebra/relations/operations/order.rb | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

(limited to 'lib/arel/algebra')

diff --git a/lib/arel/algebra/relations/operations/order.rb b/lib/arel/algebra/relations/operations/order.rb
index bb5ac1ab88..582abf642c 100644
--- a/lib/arel/algebra/relations/operations/order.rb
+++ b/lib/arel/algebra/relations/operations/order.rb
@@ -1,7 +1,6 @@
 module Arel
   class Order < Compound
     attr_reader :orderings
-    requires   :ordering
 
     def initialize(relation, *orderings, &block)
       super(relation)
@@ -21,5 +20,16 @@ module Arel
       # QUESTION - do we still need relation.orders ?
       (orderings + relation.orders).collect { |o| o.bind(self) }.collect { |o| o.to_ordering }
     end
+
+    def engine
+      engine   = relation.engine
+
+      # Temporary check of whether or not the engine supports where.
+      if engine.respond_to?(:supports) && !engine.supports(:ordering)
+        Memory::Engine.new
+      else
+        engine
+      end
+    end
   end
 end
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