部署 heroku 后，放问页面提示 The page you were looking for doesn't exist. 使用 heroku logs 查看，提示这个错误：ActionController::RoutingError (No route matches [GET] "/")。 在开发环境中，路由是正常的，用 heroku run rake routes 查看，竟然没有任何路由信息，一下就茫然了。 请懂的能给解决哈，谢谢！
Blogdemo::Application.routes.draw do
get "index_page/home"
# The priority is based upon order of creation: first created -> highest priority.
# See how all your routes lay out with "rake routes".
# You can have the root of your site routed with "root"
root 'index_page#home'
end