在控制器中包含模块时出现rails路由错误

Question

当我在控制器中包含模块时，路由不起作用，报告404未找到错误，下面是我的代码，非常示例

ruby：2.0，rails：4.2.3

routes.rb

match ':controller(/:action(/:id))', via: :all

common.rb

module Common
  class A; end
end

test_controller.rb

class TestController < ApplicationController
  include Common  # when I delete this line , this route '/test/hello' works as expected,
                  # otherwise rails reports 404 not found

  def hello
    render :json => {msg: 'hello'}
  end
end

Answer 1

module/class名称应以大写字母Common开头

module Common
  class A; end
end