mastodon/db/migrate/20171125031751_add_invite_id_to_users.rb

# frozen_string_literal: true

class AddInviteIdToUsers < ActiveRecord::Migration[5.2]
  def change
    safety_assured { add_reference :users, :invite, null: true, default: nil, foreign_key: { on_delete: :nullify }, index: false }
  end
end