# File lib/action_controller/metal/mime_responds.rb, line 231 def respond_with(*resources, &block) raise "In order to use respond_with, first you need to declare the formats your " << "controller responds to in the class level" if self.class.mimes_for_respond_to.empty? if response = retrieve_response_from_mimes(&block) options = resources.size == 1 ? {} : resources.extract_options! options.merge!(:default_response => response) (options.delete(:responder) || self.class.responder).call(self, resources, options) end end