adding factory methods to node base class

lib/arel/nodes/node.rb

@@ -3,6 +3,7 @@ module Arel
     ###
     # Abstract base class for all AST nodes
     class Node
+      include Arel::FactoryMethods
       include Enumerable
 
       ###

lib/arel/nodes/table_alias.rb

@@ -6,7 +6,7 @@ module Arel
       alias :table_alias :name
 
       def [] name
-        Attribute.new self, name
+        Attribute.new(self, name)
       end
     end
   end

test/nodes/test_node.rb

@@ -2,6 +2,10 @@ require 'helper'
 
 module Arel
   class TestNode < MiniTest::Unit::TestCase
+    def test_includes_factory_methods
+      assert Node.new.respond_to?(:create_join)
+    end
+
     def test_all_nodes_are_nodes
       Nodes.constants.map { |k|
         Nodes.const_get(k)