adding a "not" factory method for creating Not nodes

2 files changed, 18 insertions, 0 deletions

diff --git a/lib/arel/nodes/node.rb b/lib/arel/nodes/node.rb
index 43bad19488..841b954db9 100644
--- a/lib/arel/nodes/node.rb
+++ b/lib/arel/nodes/node.rb
@@ -4,6 +4,13 @@ module Arel
     # Abstract base class for all AST nodes
     class Node
       ###
+      # Factory method to create a Nodes::Not node that has the recipient of
+      # the caller as a child.
+      def not
+        Nodes::Not.new self
+      end
+
+      ###
       # Factory method to create a Nodes::Grouping node that has an Nodes::Or
       # node as a child.
       def or right
diff --git a/lib/arel/nodes/not.rb b/lib/arel/nodes/not.rb
new file mode 100644
index 0000000000..d463ae9d08
--- /dev/null
+++ b/lib/arel/nodes/not.rb
@@ -0,0 +1,11 @@
+module Arel
+  module Nodes
+    class Not < Arel::Nodes::Node
+      attr_reader :expr
+
+      def initialize expr
+        @expr = expr
+      end
+    end
+  end
+end