add_reference するときカラムネームを指定する際に_id接尾子をつけない
外部キーが欲しいときはforeign_key: true
references型ではなくinteger型等の時はadd_foreign_key 〜
この際indexは自動付与のため index:trueは書かなくて良い
参考・引用
https://qiita.com/ryouzi/items/2682e7e8a86fd2b1ae47
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