Help us understand the problem. What is going on with this article?

テーブルからカラムを削除する

3行で

  • ターミナルにコマンドを書いてmigrationファイルを作る
  • migrationファイルの中身を編集する
  • rails db:migrate

くわしく

今回の場合、usersテーブルからageカラムを削除したい。

$ rails g migration RemoveAgeFromUsers

実行するとmigrationファイルが作られる。
こちらを編集する。

作成されたmigrationファイル
class RemoveAgeFromUsers < ActiveRecord::Migration[5.2]
  def change
    remove_column :Users, :age, :integer
  end
end

ポイントはデータ型を書くこと。
問題なければ下記のコマンドを入力する。

$ rails db:migrate
Why do not you register as a user and use Qiita more conveniently?
  1. We will deliver articles that match you
    By following users and tags, you can catch up information on technical fields that you are interested in as a whole
  2. you can read useful information later efficiently
    By "stocking" the articles you like, you can search right away
Comments
Sign up for free and join this conversation.
If you already have a Qiita account
Why do not you register as a user and use Qiita more conveniently?
You need to log in to use this function. Qiita can be used more conveniently after logging in.
You seem to be reading articles frequently this month. Qiita can be used more conveniently after logging in.
  1. We will deliver articles that match you
    By following users and tags, you can catch up information on technical fields that you are interested in as a whole
  2. you can read useful information later efficiently
    By "stocking" the articles you like, you can search right away