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mergeメソッドで、入力してもらったparamsと一緒に予め別のテーブルに持っている情報を保存する

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def create Question.create(create_params) redirect_to :root and return end

private def create_params params.require(:question).permit(:text).merge(user_id: current_user.id, group_id: current_user.group_id) end

mergeメソッドを使うことによって、ストロングパラメーター(create_params)が生成される際にuser_idとgroup_idのキーと値を持つハッシュを追加することができます。

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