There's no documentation for this item.

Source Code

# File action_controller/base.rb, line 1232
def protected_instance_variables
  if view_controller_internals
    %w(@assigns @performed_redirect @performed_render)
  else
    %w(@assigns @performed_redirect @performed_render
       @_request @request @_response @response @_params @params
       @_session @session @_cookies @cookies
       @template @request_origin @parent_controller)
  end
end