Make sure we use send for the default attribute method body because the suffix...

Make sure we use send for the default attribute method body because the suffix maybe an invalid method name

activerecord/lib/active_record/attribute_methods.rb

@@ -66,7 +66,7 @@ def define_attribute_methods
               if respond_to?(generate_method)
                 send(generate_method, name)
               else
-                evaluate_attribute_method("def #{method_name}(*args); attribute#{suffix}('#{name}', *args); end", method_name)
+                evaluate_attribute_method("def #{method_name}(*args); send(:attribute#{suffix}, '#{name}', *args); end", method_name)
               end
             end
           end