AirPlay via Ethernet disabled

Recent months AirPlay on my AppleTV has been disabled with no reason.
Until now I connected AppleTV to my home network via Ethernet cable.

Just now I found that AirPlay-Ethernet feature on AppleTV has been discontinued. To resolve the issue, I changed the network connection from Ethernet to Wi-Fi connection.
Though I don't want to make Wi-Fi bandwidth crowded, I have no other choice than Wi-Fi.
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The route cause was the Wi-Fi router itself: after that the same issue appeared again. Rebooting the Wi-Fi router resolved the issue.

[Rails4] named route with helper in routes.rb

http://ruby.railstutorial.org/chapters/filling-in-the-layout?version=4.0#sec-rails_routes

In rails4, the notation of routes.rb has been changed:

Rails3:

SampleApp::Application.routes.draw do
  root to: 'static_pages#home'
  match '/help',    to: 'static_pages#help',    via: 'get'
  match '/about',   to: 'static_pages#about',   via: 'get'
  match '/contact', to: 'static_pages#contact', via: 'get'  
  .
  .
  .
end

Rails4:

SampleApp::Application.routes.draw do
  root to: 'static_pages#home'
  get 'help' => "static_pages", as: 'help'
  get 'about' => "static_pages", as: 'about'
  get 'contact' => "static_pages", as: 'contact'

Enjoy!

[ruby] rvm vs rbenv

Today I found that  i installed rvm and rbenv simultaneously. OMG.

I had to remove rbenv and rvm, then chose rvm.