From 8339f024c7663133a78c4d0a8824b5b6fafaf239 Mon Sep 17 00:00:00 2001
From: Bryan Helmkamp <bryan@brynary.com>
Date: Sun, 17 May 2009 15:42:42 -0400
Subject: recursive memory operations now possible

Conflicts:

	lib/arel/algebra/relations/relation.rb
---
 lib/arel/algebra/relations/relation.rb |  4 ----
 lib/arel/algebra/relations/row.rb      | 21 +++++++++++++++++++++
 2 files changed, 21 insertions(+), 4 deletions(-)
 create mode 100644 lib/arel/algebra/relations/row.rb

(limited to 'lib/arel/algebra/relations')

diff --git a/lib/arel/algebra/relations/relation.rb b/lib/arel/algebra/relations/relation.rb
index 6d76e66638..fe8cab4b02 100644
--- a/lib/arel/algebra/relations/relation.rb
+++ b/lib/arel/algebra/relations/relation.rb
@@ -14,10 +14,6 @@ module Arel
       self
     end
 
-    def root
-      self
-    end
-
     module Enumerable
       include ::Enumerable
 
diff --git a/lib/arel/algebra/relations/row.rb b/lib/arel/algebra/relations/row.rb
new file mode 100644
index 0000000000..2d63498452
--- /dev/null
+++ b/lib/arel/algebra/relations/row.rb
@@ -0,0 +1,21 @@
+module Arel
+  class Row
+    attributes :relation, :tuple
+    deriving :==, :initialize
+    
+    def [](attribute)
+      tuple[relation.position_of(attribute)]
+    end
+    
+    def slice(*attributes)
+      Row.new(relation, attributes.inject([]) do |cheese, attribute|
+        cheese << self[attribute]
+        cheese
+      end)
+    end
+    
+    def bind(relation)
+      Row.new(relation, tuple)
+    end
+  end
+end
\ No newline at end of file
-- 
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