upgraded to rails 3.1.0.rc1

config/initializers/wrap_parameters.rb

@@ -0,0 +1,12 @@
+# Be sure to restart your server when you modify this file.
+#
+# This file contains the settings for ActionController::ParametersWrapper
+# which will be enabled by default in the upcoming version of Ruby on Rails.
+
+# Enable parameter wrapping for JSON. You can disable this by setting :format to an empty array.
+ActionController::Base.wrap_parameters format: [:json]
+
+# Disable root element in JSON by default.
+if defined?(ActiveRecord)
+  ActiveRecord::Base.include_root_in_json = false
+end