hometown/db/migrate/20160314164231_add_owner_to_application.rb

class AddOwnerToApplication < ActiveRecord::Migration
  def change
    add_column :oauth_applications, :owner_id, :integer, null: true
    add_column :oauth_applications, :owner_type, :string, null: true
    add_index :oauth_applications, [:owner_id, :owner_type]
  end
end