More than 5 years have passed since last update.

Railsでreferencesを指定した外部キーに、Unique属性を設定する

Rails

Posted at 2019-04-19

class CreateUsers < ActiveRecord::Migration
  def change
    create_table :users do |t|
      t.references :relation, index: { unique: true }, foreign_key: true

      t.timestamps
    end
  end
end

You get articles that match your needs
You can efficiently read back useful information
You can use dark theme

What you can do with signing up