1 files changed, 2 insertions, 1 deletions
diff --git a/railties/lib/rails/generators/generated_attribute.rb b/railties/lib/rails/generators/generated_attribute.rb
index 64273e4ca4..f85375b2a3 100644
--- a/railties/lib/rails/generators/generated_attribute.rb
+++ b/railties/lib/rails/generators/generated_attribute.rb
@@ -1,4 +1,5 @@
 require 'active_support/time'
+require 'active_support/core_ext/object/inclusion'
 
 module Rails
   module Generators
@@ -44,7 +45,7 @@ module Rails
       end
 
       def reference?
-        [ :references, :belongs_to ].include?(self.type)
+        self.type.among?(:references, :belongs_to)
       end
     end
   end