respond-to

问题 In my rails app I have a ajax request to the server, to store some data. This used to work without any problem, but now I get an error: ActionController::UnknownFormat (ActionController::UnknownFormat): app/controllers/reservations_controller.rb:45:in `create\' As following is the controller and my javascript file where I declare the datatype do be JSON class ReservationController < ApplicationController respond_to :html, :json def create ... respond_to do |format| if @reservation.save format