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validationを設定していないのにエラーが出るとき

Posted at

#なぜだ

ActiveRecord::RecordInvalid: バリデーションに失敗しました

modelを確認してもマイグレーションファイルを確認してもどこにも
validationの設定はない。

それなのに出続けるエラー。

#原因
Rails5からの変更でbelongs_toに存在性のvalidationが設定されたようです。

#なので以下のように変更

belongs_to :post_id, optional: true

#参考
https://railsguides.jp/association_basics.html

https://teratail.com/questions/65278

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