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`rails s`で サーバーが起動せず、Rails の Usage がでるだけ

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Railsプロジェクト内で、rails sを実行したところ、サーバーが起動せず、以下のような Usage がでるだけという現象に遭ったんでメモ。

Usage:
  rails new APP_PATH [options]

Options:
      [--skip-namespace], [--no-skip-namespace]            # Skip namespace (affects only isolated applications)
  -r, [--ruby=PATH]                                        # Path to the Ruby binary of your choice
                                                           # Default: /Users/tokio/.rbenv/versions/2.4.1/bin/ruby
  -m, [--template=TEMPLATE]                                # Path to some application template (can be a filesystem path or URL)
  -d, [--database=DATABASE] 

...hogehoge

以下を実行したらなおった。

bundle exec rake rails:update:bin

自分の場合は、 development 環境でごちゃごちゃしたかったんで、一応以下のようにオプションつけてやった。

bundle exec rake rails:update:bin RAILS_ENV=development
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