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Railsでサブドメインのroutesを定義する方法

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以前は下記リンクのrailscastに紹介されている方法で実装していました。

http://railscasts.com/episodes/221-subdomains-in-rails-3

しかし、改めてRails guideを調べてみるともっと簡単に出来る様です

constraints subdomain: 'api' do
  # api.sample.com
end

constraints subdomain: '' do
  # sample.com
end
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