modelじゃなくてviewにvalidationをかけたい
下のコードをコピればvalidationが実装できる
html.erb
<%= label_tag :name, 'なまえ (必須)' %>
<input type="text" name="name" id="name" required placeholder='Your name'>
参考
https://qiita.com/oh_rusty_nail/items/e08f6b323d526fab3d55
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