From 3878a115a3d53eb817c0fbab3e5ca7ec1427f0be Mon Sep 17 00:00:00 2001
From: Aaron Patterson <aaron.patterson@gmail.com>
Date: Wed, 28 Jul 2010 15:58:36 -0700
Subject: refactor for faster method lookup

---
 lib/arel/algebra/relations/relation.rb       | 26 ++++++++++++++------------
 spec/algebra/unit/relations/relation_spec.rb |  2 +-
 2 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/lib/arel/algebra/relations/relation.rb b/lib/arel/algebra/relations/relation.rb
index ccc1ab558f..e8ef9b395d 100644
--- a/lib/arel/algebra/relations/relation.rb
+++ b/lib/arel/algebra/relations/relation.rb
@@ -116,7 +116,7 @@ module Arel
       end
 
       %w{
-        where project order skip group having
+        where order skip group having
       }.each do |operation_name|
         class_eval <<-OPERATION, __FILE__, __LINE__
           def #{operation_name}(*arguments)
@@ -126,6 +126,11 @@ module Arel
         OPERATION
       end
 
+      def project *args
+        return self if args.all? { |x| x.blank? }
+        Project.new self, *args
+      end
+
       def take thing
         Take.new self, thing
       end
@@ -142,20 +147,17 @@ module Arel
         Alias.new(self)
       end
 
-      module Writable
-        def insert(record)
-          session.create Insert.new(self, record)
-        end
+      def insert(record)
+        session.create Insert.new(self, record)
+      end
 
-        def update(assignments)
-          session.update Update.new(self, assignments)
-        end
+      def update(assignments)
+        session.update Update.new(self, assignments)
+      end
 
-        def delete
-          session.delete Deletion.new(self)
-        end
+      def delete
+        session.delete Deletion.new(self)
       end
-      include Writable
 
       JoinOperation = Struct.new(:join_class, :relation1, :relation2) do
         def on(*predicates)
diff --git a/spec/algebra/unit/relations/relation_spec.rb b/spec/algebra/unit/relations/relation_spec.rb
index 8d0639ee07..2a2fb15d89 100644
--- a/spec/algebra/unit/relations/relation_spec.rb
+++ b/spec/algebra/unit/relations/relation_spec.rb
@@ -159,7 +159,7 @@ module Arel
         end
       end
 
-      describe Relation::Operable::Writable do
+      describe 'relation is writable' do
         describe '#delete' do
           it 'manufactures a deletion relation' do
             Session.start do |s|
-- 
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