メモ
プルダウン
<%= f.collection_select(:genre_id, Genre.all, :id, :name, {}, {class:"genre-select"}) %>
<%= form.collection_select(保存されるカラム名, オブジェクトの配列, カラムに保存される項目, 選択肢に表示されるカラム名, オプション, htmlオプション) %>
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