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collection_selectにデフォルト値で空欄を設定する方法

Posted at 2020-03-06

環境　rails 5.2.3 ,ruby 2.5.1

先に結論から

include_blank: true
を付ける！

付け方（例）

= i.collection_select :month_id, Month.all, :id, :name, include_blank: true

view画面では

見事空欄が表示できた！

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