class AddInstanceActor < ActiveRecord::Migration[5.2] class Account < ApplicationRecord # Dummy class, to make migration possible across version changes validates :username, uniqueness: { scope: :domain, case_sensitive: false } end def up Account.create!(id: -99, actor_type: 'Application', locked: true, username: Rails.configuration.x.local_domain) end def down Account.find_by(id: -99, actor_type: 'Application').destroy! end end