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diff --git a/vendor/rails/activesupport/lib/active_support/core_ext/module/attr_accessor_with_default.rb b/vendor/rails/activesupport/lib/active_support/core_ext/module/attr_accessor_with_default.rb
new file mode 100644
index 0000000..683789d
--- /dev/null
+++ b/vendor/rails/activesupport/lib/active_support/core_ext/module/attr_accessor_with_default.rb
@@ -0,0 +1,31 @@
+class Module
+  # Declare an attribute accessor with an initial default return value.
+  #
+  # To give attribute <tt>:age</tt> the initial value <tt>25</tt>:
+  #  
+  #   class Person
+  #     attr_accessor_with_default :age, 25
+  #   end
+  #
+  #   some_person.age
+  #   => 25
+  #   some_person.age = 26
+  #   some_person.age
+  #   => 26
+  #
+  # To give attribute <tt>:element_name</tt> a dynamic default value, evaluated
+  # in scope of self:
+  #
+  #   attr_accessor_with_default(:element_name) { name.underscore } 
+  #
+  def attr_accessor_with_default(sym, default = nil, &block)
+    raise 'Default value or block required' unless !default.nil? || block
+    define_method(sym, block_given? ? block : Proc.new { default })
+    module_eval(<<-EVAL, __FILE__, __LINE__)
+      def #{sym}=(value)
+        class << self; attr_reader :#{sym} end
+        @#{sym} = value
+      end
+    EVAL
+  end
+end