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http://jewelrybox.wpblog.jp/2017/10/09/%e3%80%8cwill_paginate%e3%80%8d%e3%81%a7%e3%83%9a%e3%83%bc%e3%82%b8%e3%83%8d%e3%83%bc%e3%82%b7%e3%83%a7%e3%83%b3-rails5/
「will_paginate」でページネーション rails5