Strong params: Raise in development if unpermitted params are found

Rails 4:

config.action_controller.action_on_unpermitted_parameters enables logging or raising an exception if parameters that are not explicitly permitted are found. Set to :log or :raise to enable. The default value is :log in development and test environments, and false in all other environments.

Rails 3:

If you include the strong_params gem, see the Readme Show archive.org snapshot for handling unpermitted keys.