From 496134516e19acd93772cfff8eafa4cb2dd8bc8d Mon Sep 17 00:00:00 2001
From: Aaron Patterson <aaron.patterson@gmail.com>
Date: Sun, 25 Jul 2010 17:56:34 -0700
Subject: more unfactoring

---
 lib/arel/algebra/relations/operations/where.rb | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

(limited to 'lib/arel/algebra')

diff --git a/lib/arel/algebra/relations/operations/where.rb b/lib/arel/algebra/relations/operations/where.rb
index 3c5df117f6..e8db2ec8b0 100644
--- a/lib/arel/algebra/relations/operations/where.rb
+++ b/lib/arel/algebra/relations/operations/where.rb
@@ -1,18 +1,34 @@
 module Arel
   class Where < Compound
-    attributes :relation, :predicates
-    deriving   :==
-    requires   :restricting
+    attr_reader :predicates
 
     def initialize(relation, *predicates)
+      super(relation)
       predicates = [yield(relation)] + predicates if block_given?
       @predicates = predicates.map { |p| p.bind(relation) }
-      @relation   = relation
       @wheres = nil
     end
 
     def wheres
       @wheres ||= relation.wheres + predicates
     end
+
+    def == other
+      super ||
+        Where === other &&
+        relation == other.relation &&
+        predicates == other.predicates
+    end
+
+    def engine
+      engine   = relation.engine
+
+      # Temporary check of whether or not the engine supports where.
+      if engine.respond_to?(:supports) && !engine.supports(:restricting)
+        Memory::Engine.new
+      else
+        engine
+      end
+    end
   end
 end
-- 
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