From 11e29a32af658ee0956b1237fea1033698a457e8 Mon Sep 17 00:00:00 2001
From: Aaron Patterson <aaron.patterson@gmail.com>
Date: Thu, 9 Dec 2010 14:48:28 -0800
Subject: AND nodes are now n-ary

---
 lib/arel/nodes/and.rb       | 17 +++++++++++++++++
 lib/arel/nodes/node.rb      |  2 +-
 lib/arel/select_manager.rb  | 14 ++++++--------
 lib/arel/visitors/to_sql.rb |  2 +-
 4 files changed, 25 insertions(+), 10 deletions(-)

(limited to 'lib/arel')

diff --git a/lib/arel/nodes/and.rb b/lib/arel/nodes/and.rb
index 80f420b4f1..b087a10930 100644
--- a/lib/arel/nodes/and.rb
+++ b/lib/arel/nodes/and.rb
@@ -1,6 +1,23 @@
 module Arel
   module Nodes
     class And < Arel::Nodes::Binary
+      attr_reader :children
+
+      def initialize children, right = nil
+        unless Array === children
+          warn "(#{caller.first}) AND nodes should be created with a list"
+          children = [children, right]
+        end
+        @children = children
+      end
+
+      def left
+        children.first
+      end
+
+      def right
+        children[1]
+      end
     end
   end
 end
diff --git a/lib/arel/nodes/node.rb b/lib/arel/nodes/node.rb
index 567221aab2..ff788e90d2 100644
--- a/lib/arel/nodes/node.rb
+++ b/lib/arel/nodes/node.rb
@@ -22,7 +22,7 @@ module Arel
       ###
       # Factory method to create an Nodes::And node.
       def and right
-        Nodes::And.new self, right
+        Nodes::And.new [self, right]
       end
 
       # FIXME: this method should go away.  I don't like people calling
diff --git a/lib/arel/select_manager.rb b/lib/arel/select_manager.rb
index 30495fc8d0..40e197910b 100644
--- a/lib/arel/select_manager.rb
+++ b/lib/arel/select_manager.rb
@@ -198,14 +198,12 @@ module Arel
     def collapse exprs
       return exprs.first if exprs.length == 1
 
-      right = exprs.pop
-      left  = exprs.pop
-
-      right = Nodes::SqlLiteral.new(right) if String === right
-
-      right = Nodes::And.new left, right
-      exprs.reverse.inject(right) { |memo,expr|
-        Nodes::And.new(expr, memo)
+      Nodes::And.new exprs.compact.map { |expr|
+        if String === expr
+          Arel.sql(expr)
+        else
+          expr
+        end
       }
     end
   end
diff --git a/lib/arel/visitors/to_sql.rb b/lib/arel/visitors/to_sql.rb
index 308a5bf400..5767fbae8d 100644
--- a/lib/arel/visitors/to_sql.rb
+++ b/lib/arel/visitors/to_sql.rb
@@ -254,7 +254,7 @@ module Arel
       end
 
       def visit_Arel_Nodes_And o
-        "#{visit o.left} AND #{visit o.right}"
+        o.children.map { |x| visit x }.join ' AND '
       end
 
       def visit_Arel_Nodes_Or o
-- 
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