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Railsで表示中のページのパスを判定する方法

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以下のように、current_page?メソッドを用いることによって、表示中のページのパスを判定できる。
これはUrlHelperとして実装されているため、ビューの中から呼び出すことができる。

# root_path かどうか
current_page?(root_path)

# /users/:id が current_user かどうか
current_page?(current_user)

# 任意のコントローラ/アクションかどうか
current_page?(controller: 'foo', action: 'bar')

参考

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