rails_room https://blog.hatena.ne.jp/rails_room/ Rubyプログラマーの備忘録 https://rails-room.hatenadiary.org/ ruby QuestionColumnテーブルにpresent_project_idを追加 ruby script/generate migration AddPresent_project_idToQuestionColumn present_project_id:integer 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Frails-room.hatenadiary.org%2Fentry%2F20100926%2F1285476146" title="カラムを追加する方法 - Rubyプログラマーの備忘録" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2010-09-26 13:42:26 rich https://rails-room.hatenadiary.org/entry/20100926/1285476146 1.0 100%