1 files changed, 7 insertions, 6 deletions
diff --git a/lib/arel/attributes/attribute.rb b/lib/arel/attributes/attribute.rb
index e027a65a74..5cbe194b41 100644
--- a/lib/arel/attributes/attribute.rb
+++ b/lib/arel/attributes/attribute.rb
@@ -5,12 +5,13 @@ module Arel
       include Arel::Predications
     end
 
-    class String  < Attribute; end
-    class Time    < Attribute; end
-    class Boolean < Attribute; end
-    class Decimal < Attribute; end
-    class Float   < Attribute; end
-    class Integer < Attribute; end
+    class String    < Attribute; end
+    class Time      < Attribute; end
+    class Boolean   < Attribute; end
+    class Decimal   < Attribute; end
+    class Float     < Attribute; end
+    class Integer   < Attribute; end
+    class Undefined < Attribute; end
   end
 
   Attribute = Attributes::Attribute